77466978 has 24 divisors (see below), whose sum is σ = 168822108. Its totient is φ = 25672032.

The previous prime is 77466959. The next prime is 77466979. The reversal of 77466978 is 87966477.

It can be written as a sum of positive squares in 2 ways, for example, as 76160529 + 1306449 = 8727^2 + 1143^2 .

It is a super-2 number, since 2×77466978² = 12002265360904968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77466979) 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, 9325 + ... + 15552.

Almost surely, 2^77466978 is an apocalyptic number.

77466978 is an abundant number, since it is smaller than the sum of its proper divisors (91355130).

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

77466978 is a wasteful number, since it uses less digits than its factorization.

77466978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25058 (or 25055 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The square root of 77466978 is about 8801.5327074323. The cubic root of 77466978 is about 426.2903858903.

The spelling of 77466978 in words is "seventy-seven million, four hundred sixty-six thousand, nine hundred seventy-eight".