78417956 has 12 divisors (see below), whose sum is σ = 137576460. Its totient is φ = 39110400.

The previous prime is 78417947. The next prime is 78418027. The reversal of 78417956 is 65971487.

It can be written as a sum of positive squares in 2 ways, for example, as 66748900 + 11669056 = 8170^2 + 3416^2 .

It is a super-2 number, since 2×78417956² = 12298751646435872, 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 78417956.

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, 22841 + ... + 26048.

It is an arithmetic number, because the mean of its divisors is an integer number (11464705).

Almost surely, 2^78417956 is an apocalyptic number.

It is an amenable number.

78417956 is a deficient number, since it is larger than the sum of its proper divisors (59158504).

78417956 is a wasteful number, since it uses less digits than its factorization.

78417956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49294 (or 49292 counting only the distinct ones).

The product of its digits is 423360, while the sum is 47.

The square root of 78417956 is about 8855.3913521651. The cubic root of 78417956 is about 428.0276643836.

It can be divided in two parts, 784 and 17956, that multiplied together give a square (14077504 = 3752²).

The spelling of 78417956 in words is "seventy-eight million, four hundred seventeen thousand, nine hundred fifty-six".