72395728 has 10 divisors (see below), whose sum is σ = 140266754. Its totient is φ = 36197856.

The previous prime is 72395699. The next prime is 72395731. The reversal of 72395728 is 82759327.

It can be written as a sum of positive squares in only one way, i.e., 71774784 + 620944 = 8472^2 + 788^2 .

It is a super-2 number, since 2×72395728² = 10482282865299968, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2262351 + ... + 2262382.

Almost surely, 2^72395728 is an apocalyptic number.

It is an amenable number.

72395728 is a deficient number, since it is larger than the sum of its proper divisors (67871026).

72395728 is a wasteful number, since it uses less digits than its factorization.

72395728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4524741 (or 4524735 counting only the distinct ones).

The product of its digits is 211680, while the sum is 43.

The square root of 72395728 is about 8508.5679171057. The cubic root of 72395728 is about 416.7775460290. Note that the first 3 decimals are identical.

The spelling of 72395728 in words is "seventy-two million, three hundred ninety-five thousand, seven hundred twenty-eight".