72815426 has 32 divisors (see below), whose sum is σ = 116157888. Its totient is φ = 34191360.

The previous prime is 72815417. The next prime is 72815441. The reversal of 72815426 is 62451827.

It is a super-2 number, since 2×72815426² = 10604172527122952, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 in 15 ways as a sum of consecutive naturals, for example, 377186 + ... + 377378.

It is an arithmetic number, because the mean of its divisors is an integer number (3629934).

Almost surely, 2^72815426 is an apocalyptic number.

72815426 is a deficient number, since it is larger than the sum of its proper divisors (43342462).

72815426 is a wasteful number, since it uses less digits than its factorization.

72815426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386.

The product of its digits is 26880, while the sum is 35.

The square root of 72815426 is about 8533.1955327415. The cubic root of 72815426 is about 417.5813861203.

The spelling of 72815426 in words is "seventy-two million, eight hundred fifteen thousand, four hundred twenty-six".