72700728 has 32 divisors (see below), whose sum is σ = 185621760. Its totient is φ = 23717600.

The previous prime is 72700717. The next prime is 72700757. The reversal of 72700728 is 82700727.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31098 + ... + 33353.

It is an arithmetic number, because the mean of its divisors is an integer number (5800680).

Almost surely, 2^72700728 is an apocalyptic number.

It is an amenable number.

72700728 is an abundant number, since it is smaller than the sum of its proper divisors (112921032).

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

72700728 is a wasteful number, since it uses less digits than its factorization.

72700728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64507 (or 64503 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 72700728 is about 8526.4721895987. The cubic root of 72700728 is about 417.3620144717.

Subtracting 72700728 from its reverse (82700727), we obtain a palindrome (9999999).

The spelling of 72700728 in words is "seventy-two million, seven hundred thousand, seven hundred twenty-eight".