78609856 has 28 divisors (see below), whose sum is σ = 167992552. Its totient is φ = 36281088.

The previous prime is 78609841. The next prime is 78609857. The reversal of 78609856 is 65890687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78609857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46410 + ... + 48073.

It is an arithmetic number, because the mean of its divisors is an integer number (5999734).

Almost surely, 2^78609856 is an apocalyptic number.

It is an amenable number.

78609856 is an abundant number, since it is smaller than the sum of its proper divisors (89382696).

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

78609856 is a wasteful number, since it uses less digits than its factorization.

78609856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94508 (or 94498 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 78609856 is about 8866.2199386210. The cubic root of 78609856 is about 428.3765283528.

The spelling of 78609856 in words is "seventy-eight million, six hundred nine thousand, eight hundred fifty-six".