72320732 has 18 divisors (see below), whose sum is σ = 139113744. Its totient is φ = 32872840.

The previous prime is 72320723. The next prime is 72320753. The reversal of 72320732 is 23702327.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74228 + ... + 75195.

Almost surely, 2^72320732 is an apocalyptic number.

It is an amenable number.

72320732 is a deficient number, since it is larger than the sum of its proper divisors (66793012).

72320732 is a wasteful number, since it uses less digits than its factorization.

72320732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149449 (or 149436 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 26.

The square root of 72320732 is about 8504.1596880585. The cubic root of 72320732 is about 416.6335805906.

The spelling of 72320732 in words is "seventy-two million, three hundred twenty thousand, seven hundred thirty-two".