72774664 has 8 divisors (see below), whose sum is σ = 136452510. Its totient is φ = 36387328.

The previous prime is 72774661. The next prime is 72774679. The reversal of 72774664 is 46647727.

It can be written as a sum of positive squares in only one way, i.e., 63520900 + 9253764 = 7970^2 + 3042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 72774664.

It is not an unprimeable number, because it can be changed into a prime (72774661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4548409 + ... + 4548424.

Almost surely, 2^72774664 is an apocalyptic number.

It is an amenable number.

72774664 is a deficient number, since it is larger than the sum of its proper divisors (63677846).

72774664 is a wasteful number, since it uses less digits than its factorization.

72774664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9096839 (or 9096835 counting only the distinct ones).

The product of its digits is 395136, while the sum is 43.

The square root of 72774664 is about 8530.8067613796. The cubic root of 72774664 is about 417.5034510334.

The spelling of 72774664 in words is "seventy-two million, seven hundred seventy-four thousand, six hundred sixty-four".