72100664 has 8 divisors (see below), whose sum is σ = 135188760. Its totient is φ = 36050328.

The previous prime is 72100631. The next prime is 72100681. The reversal of 72100664 is 46600127.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4506284 + ... + 4506299.

It is an arithmetic number, because the mean of its divisors is an integer number (16898595).

Almost surely, 2^72100664 is an apocalyptic number.

It is an amenable number.

72100664 is a deficient number, since it is larger than the sum of its proper divisors (63088096).

72100664 is a wasteful number, since it uses less digits than its factorization.

72100664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9012589 (or 9012585 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 72100664 is about 8491.2109854838. The cubic root of 72100664 is about 416.2105535459.

The spelling of 72100664 in words is "seventy-two million, one hundred thousand, six hundred sixty-four".