72351728 has 30 divisors (see below), whose sum is σ = 148922016. Its totient is φ = 34045696.

The previous prime is 72351709. The next prime is 72351733. The reversal of 72351728 is 82715327.

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, 3200 + ... + 12447.

Almost surely, 2^72351728 is an apocalyptic number.

It is an amenable number.

72351728 is an abundant number, since it is smaller than the sum of its proper divisors (76570288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72351728 is a wasteful number, since it uses less digits than its factorization.

72351728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15689 (or 15666 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 72351728 is about 8505.9818951136. The cubic root of 72351728 is about 416.6930938616.

The spelling of 72351728 in words is "seventy-two million, three hundred fifty-one thousand, seven hundred twenty-eight".