77646474 has 12 divisors (see below), whose sum is σ = 168234066. Its totient is φ = 25882152.

The previous prime is 77646467. The next prime is 77646487. The reversal of 77646474 is 47464677.

It can be written as a sum of positive squares in only one way, i.e., 71520849 + 6125625 = 8457^2 + 2475^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2156829 + ... + 2156864.

Almost surely, 2^77646474 is an apocalyptic number.

77646474 is an abundant number, since it is smaller than the sum of its proper divisors (90587592).

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

77646474 is a wasteful number, since it uses less digits than its factorization.

77646474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4313701 (or 4313698 counting only the distinct ones).

The product of its digits is 790272, while the sum is 45.

The square root of 77646474 is about 8811.7236679324. The cubic root of 77646474 is about 426.6193793894.

The spelling of 77646474 in words is "seventy-seven million, six hundred forty-six thousand, four hundred seventy-four".