76430978 has 24 divisors (see below), whose sum is σ = 129090108. Its totient is φ = 33736032.

The previous prime is 76430971. The next prime is 76430989. The reversal of 76430978 is 87903467.

It can be written as a sum of positive squares in 2 ways, for example, as 75986089 + 444889 = 8717^2 + 667^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (76430971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10976 + ... + 16532.

Almost surely, 2^76430978 is an apocalyptic number.

76430978 is a deficient number, since it is larger than the sum of its proper divisors (52659130).

76430978 is a wasteful number, since it uses less digits than its factorization.

76430978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5618 (or 5595 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 76430978 is about 8742.4812267456. The cubic root of 76430978 is about 424.3815281006.

The spelling of 76430978 in words is "seventy-six million, four hundred thirty thousand, nine hundred seventy-eight".