72912806 has 16 divisors (see below), whose sum is σ = 117808128. Its totient is φ = 33745800.

The previous prime is 72912803. The next prime is 72912877. The reversal of 72912806 is 60821927.

72912806 = 244² + 245² + ... + 615².

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72912803) by changing a digit.

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, 24140 + ... + 26991.

It is an arithmetic number, because the mean of its divisors is an integer number (7363008).

Almost surely, 2^72912806 is an apocalyptic number.

72912806 is a deficient number, since it is larger than the sum of its proper divisors (44895322).

72912806 is a wasteful number, since it uses less digits than its factorization.

72912806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51187.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 72912806 is about 8538.8995778145. The cubic root of 72912806 is about 417.7674545751.

The spelling of 72912806 in words is "seventy-two million, nine hundred twelve thousand, eight hundred six".