78451656 has 16 divisors (see below), whose sum is σ = 196129200. Its totient is φ = 26150544.

The previous prime is 78451621. The next prime is 78451687. The reversal of 78451656 is 65615487.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1634386 + ... + 1634433.

It is an arithmetic number, because the mean of its divisors is an integer number (12258075).

Almost surely, 2^78451656 is an apocalyptic number.

It is an amenable number.

78451656 is an abundant number, since it is smaller than the sum of its proper divisors (117677544).

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

78451656 is a wasteful number, since it uses less digits than its factorization.

78451656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3268828 (or 3268824 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 78451656 is about 8857.2939434118. The cubic root of 78451656 is about 428.0889703531.

The spelling of 78451656 in words is "seventy-eight million, four hundred fifty-one thousand, six hundred fifty-six".