72891806 has 16 divisors (see below), whose sum is σ = 118652688. Its totient is φ = 33384000.

The previous prime is 72891781. The next prime is 72891811. The reversal of 72891806 is 60819827.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7295 + ... + 14106.

It is an arithmetic number, because the mean of its divisors is an integer number (7415793).

Almost surely, 2^72891806 is an apocalyptic number.

72891806 is a deficient number, since it is larger than the sum of its proper divisors (45760882).

72891806 is a wasteful number, since it uses less digits than its factorization.

72891806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21547.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 72891806 is about 8537.6698226155. The cubic root of 72891806 is about 417.7273429247.

The spelling of 72891806 in words is "seventy-two million, eight hundred ninety-one thousand, eight hundred six".