78897500 has 120 divisors (see below), whose sum is σ = 199436160. Its totient is φ = 27000000.

The previous prime is 78897499. The next prime is 78897503. The reversal of 78897500 is 579887.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78897503) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 522425 + ... + 522575.

It is an arithmetic number, because the mean of its divisors is an integer number (1661968).

Almost surely, 2^78897500 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 78897500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99718080).

78897500 is an abundant number, since it is smaller than the sum of its proper divisors (120538660).

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

78897500 is a wasteful number, since it uses less digits than its factorization.

78897500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 44.

The square root of 78897500 is about 8882.4264702839. The cubic root of 78897500 is about 428.8983880635.

It can be divided in two parts, 78897 and 500, that added together give a palindrome (79397).

The spelling of 78897500 in words is "seventy-eight million, eight hundred ninety-seven thousand, five hundred".