72797728 has 24 divisors (see below), whose sum is σ = 144936540. Its totient is φ = 35988480.

The previous prime is 72797713. The next prime is 72797731. The reversal of 72797728 is 82779727.

It can be written as a sum of positive squares in 2 ways, for example, as 72795024 + 2704 = 8532^2 + 52^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 9933 + ... + 15628.

Almost surely, 2^72797728 is an apocalyptic number.

It is an amenable number.

72797728 is a deficient number, since it is larger than the sum of its proper divisors (72138812).

72797728 is a wasteful number, since it uses less digits than its factorization.

72797728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25660 (or 25652 counting only the distinct ones).

The product of its digits is 691488, while the sum is 49.

The square root of 72797728 is about 8532.1584607882. The cubic root of 72797728 is about 417.5475519242.

The spelling of 72797728 in words is "seventy-two million, seven hundred ninety-seven thousand, seven hundred twenty-eight".