72781226 has 16 divisors (see below), whose sum is σ = 124938240. Its totient is φ = 31149360.

The previous prime is 72781207. The next prime is 72781231. The reversal of 72781226 is 62218727.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8471 + ... + 14741.

It is an arithmetic number, because the mean of its divisors is an integer number (7808640).

Almost surely, 2^72781226 is an apocalyptic number.

72781226 is a deficient number, since it is larger than the sum of its proper divisors (52157014).

72781226 is a wasteful number, since it uses less digits than its factorization.

72781226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7109.

The product of its digits is 18816, while the sum is 35.

The square root of 72781226 is about 8531.1913587728. The cubic root of 72781226 is about 417.5159992435.

The spelling of 72781226 in words is "seventy-two million, seven hundred eighty-one thousand, two hundred twenty-six".