77913668 has 12 divisors (see below), whose sum is σ = 155827392. Its totient is φ = 33391560.

The previous prime is 77913607. The next prime is 77913679. The reversal of 77913668 is 86631977.

77913668 is an admirable number.

It is a super-2 number, since 2×77913668² = 12141079322428448, which contains 22 as substring.

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, 1391288 + ... + 1391343.

It is an arithmetic number, because the mean of its divisors is an integer number (12985616).

Almost surely, 2^77913668 is an apocalyptic number.

It is an amenable number.

77913668 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

77913668 is a wasteful number, since it uses less digits than its factorization.

77913668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782642 (or 2782640 counting only the distinct ones).

The product of its digits is 381024, while the sum is 47.

The square root of 77913668 is about 8826.8719261129. The cubic root of 77913668 is about 427.1081744335.

The spelling of 77913668 in words is "seventy-seven million, nine hundred thirteen thousand, six hundred sixty-eight".