78105500 has 72 divisors (see below), whose sum is σ = 187644912. Its totient is φ = 28380000.

The previous prime is 78105491. The next prime is 78105529. The reversal of 78105500 is 550187.

It is a super-2 number, since 2×78105500² = 12200938260500000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78105500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59855 + ... + 61145.

Almost surely, 2^78105500 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 78105500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93822456).

78105500 is an abundant number, since it is smaller than the sum of its proper divisors (109539412).

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

78105500 is a wasteful number, since it uses less digits than its factorization.

78105500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 78105500 is about 8837.7316094120. The cubic root of 78105500 is about 427.4584162099.

Adding to 78105500 its reverse (550187), we get a palindrome (78655687).

The spelling of 78105500 in words is "seventy-eight million, one hundred five thousand, five hundred".