78666056 has 32 divisors (see below), whose sum is σ = 168972480. Its totient is φ = 33633600.

The previous prime is 78666053. The next prime is 78666059. The reversal of 78666056 is 65066687.

It is an interprime number because it is at equal distance from previous prime (78666053) and next prime (78666059).

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78665998 and 78666016.

It is not an unprimeable number, because it can be changed into a prime (78666053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26066 + ... + 28926.

It is an arithmetic number, because the mean of its divisors is an integer number (5280390).

Almost surely, 2^78666056 is an apocalyptic number.

It is an amenable number.

78666056 is an abundant number, since it is smaller than the sum of its proper divisors (90306424).

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

78666056 is a wasteful number, since it uses less digits than its factorization.

78666056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365 (or 3361 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 78666056 is about 8869.3887049785. The cubic root of 78666056 is about 428.4785894564.

The spelling of 78666056 in words is "seventy-eight million, six hundred sixty-six thousand, fifty-six".