78556890 has 32 divisors (see below), whose sum is σ = 188770176. Its totient is φ = 20922560.

The previous prime is 78556873. The next prime is 78556913. The reversal of 78556890 is 9865587.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44464 + ... + 46196.

It is an arithmetic number, because the mean of its divisors is an integer number (5899068).

Almost surely, 2^78556890 is an apocalyptic number.

78556890 is an abundant number, since it is smaller than the sum of its proper divisors (110213286).

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

78556890 is a wasteful number, since it uses less digits than its factorization.

78556890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254.

The product of its (nonzero) digits is 604800, while the sum is 48.

The square root of 78556890 is about 8863.2324803088. The cubic root of 78556890 is about 428.2802957675.

It can be divided in two parts, 785 and 56890, that added together give a palindrome (57675).

The spelling of 78556890 in words is "seventy-eight million, five hundred fifty-six thousand, eight hundred ninety".