78012500 has 54 divisors (see below), whose sum is σ = 172828782. Its totient is φ = 30810000.

The previous prime is 78012497. The next prime is 78012503. The reversal of 78012500 is 521087.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an interprime number because it is at equal distance from previous prime (78012497) and next prime (78012503).

It can be written as a sum of positive squares in 3 ways, for example, as 36048016 + 41964484 = 6004^2 + 6478^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78012503) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 987461 + ... + 987539.

It is an arithmetic number, because the mean of its divisors is an integer number (3200533).

Almost surely, 2^78012500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78012500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86414391).

78012500 is an abundant number, since it is smaller than the sum of its proper divisors (94816282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78012500 is an frugal number, since it uses more digits than its factorization.

78012500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 78012500 is about 8832.4685111242. The cubic root of 78012500 is about 427.2886909821.

Adding to 78012500 its reverse (521087), we get a palindrome (78533587).

It can be divided in two parts, 7801 and 2500, that added together give a palindrome (10301).

The spelling of 78012500 in words is "seventy-eight million, twelve thousand, five hundred".