72809906 has 16 divisors (see below), whose sum is σ = 117902400. Its totient is φ = 33522768.

The previous prime is 72809903. The next prime is 72809911. The reversal of 72809906 is 60990827.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72809903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8225 + ... + 14603.

It is an arithmetic number, because the mean of its divisors is an integer number (7368900).

Almost surely, 2^72809906 is an apocalyptic number.

72809906 is a deficient number, since it is larger than the sum of its proper divisors (45092494).

72809906 is a wasteful number, since it uses less digits than its factorization.

72809906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6833.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 72809906 is about 8532.8720838883. The cubic root of 72809906 is about 417.5708338347.

The spelling of 72809906 in words is "seventy-two million, eight hundred nine thousand, nine hundred six".