77908664 has 32 divisors (see below), whose sum is σ = 154224000. Its totient is φ = 36794592.

The previous prime is 77908661. The next prime is 77908667. The reversal of 77908664 is 46680977.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77908661) and next prime (77908667).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77908661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75947 + ... + 76965.

It is an arithmetic number, because the mean of its divisors is an integer number (4819500).

Almost surely, 2^77908664 is an apocalyptic number.

It is an amenable number.

77908664 is a deficient number, since it is larger than the sum of its proper divisors (76315336).

77908664 is a wasteful number, since it uses less digits than its factorization.

77908664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547 (or 1543 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 77908664 is about 8826.5884689386. The cubic root of 77908664 is about 427.0990305733.

The spelling of 77908664 in words is "seventy-seven million, nine hundred eight thousand, six hundred sixty-four".