72720646 has 8 divisors (see below), whose sum is σ = 109129824. Its totient is φ = 36344040.

The previous prime is 72720631. The next prime is 72720667. The reversal of 72720646 is 64602727.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 1465 + ... + 12148.

It is an arithmetic number, because the mean of its divisors is an integer number (13641228).

Almost surely, 2^72720646 is an apocalyptic number.

72720646 is a deficient number, since it is larger than the sum of its proper divisors (36409178).

72720646 is a wasteful number, since it uses less digits than its factorization.

72720646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16286.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 72720646 is about 8527.6401190482. The cubic root of 72720646 is about 417.4001262292.

The spelling of 72720646 in words is "seventy-two million, seven hundred twenty thousand, six hundred forty-six".