74907978 has 32 divisors (see below), whose sum is σ = 154176000. Its totient is φ = 24249456.

The previous prime is 74907971. The next prime is 74907979. The reversal of 74907978 is 87970947.

It is a super-2 number, since 2×74907978² = 11222410336096968, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 74907978.

It is not an unprimeable number, because it can be changed into a prime (74907971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50613 + ... + 52071.

It is an arithmetic number, because the mean of its divisors is an integer number (4818000).

Almost surely, 2^74907978 is an apocalyptic number.

74907978 is an abundant number, since it is smaller than the sum of its proper divisors (79268022).

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

74907978 is a wasteful number, since it uses less digits than its factorization.

74907978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706.

The product of its (nonzero) digits is 889056, while the sum is 51.

The square root of 74907978 is about 8654.9395145200. The cubic root of 74907978 is about 421.5437857051.

The spelling of 74907978 in words is "seventy-four million, nine hundred seven thousand, nine hundred seventy-eight".