72326638 has 16 divisors (see below), whose sum is σ = 115267680. Its totient is φ = 33971616.

The previous prime is 72326621. The next prime is 72326641. The reversal of 72326638 is 83662327.

It is a super-2 number, since 2×72326638² = 10462285128766088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a junction number, because it is equal to n+sod(n) for n = 72326597 and 72326606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14706 + ... + 18997.

It is an arithmetic number, because the mean of its divisors is an integer number (7204230).

Almost surely, 2^72326638 is an apocalyptic number.

72326638 is a deficient number, since it is larger than the sum of its proper divisors (42941042).

72326638 is a wasteful number, since it uses less digits than its factorization.

72326638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33771.

The product of its digits is 72576, while the sum is 37.

The square root of 72326638 is about 8504.5069228028. The cubic root of 72326638 is about 416.6449216030.

The spelling of 72326638 in words is "seventy-two million, three hundred twenty-six thousand, six hundred thirty-eight".