77791664 has 10 divisors (see below), whose sum is σ = 150721380. Its totient is φ = 38895824.

The previous prime is 77791663. The next prime is 77791709. The reversal of 77791664 is 46619777.

It is not an unprimeable number, because it can be changed into a prime (77791663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2430974 + ... + 2431005.

It is an arithmetic number, because the mean of its divisors is an integer number (15072138).

Almost surely, 2^77791664 is an apocalyptic number.

It is an amenable number.

77791664 is a deficient number, since it is larger than the sum of its proper divisors (72929716).

77791664 is a wasteful number, since it uses less digits than its factorization.

77791664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4861987 (or 4861981 counting only the distinct ones).

The product of its digits is 444528, while the sum is 47.

The square root of 77791664 is about 8819.9582765453. The cubic root of 77791664 is about 426.8851235892.

The spelling of 77791664 in words is "seventy-seven million, seven hundred ninety-one thousand, six hundred sixty-four".