81872914 has 16 divisors (see below), whose sum is σ = 125061120. Its totient is φ = 40191840.

The previous prime is 81872911. The next prime is 81872933. The reversal of 81872914 is 41927818.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81872911) 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, 28822 + ... + 31534.

It is an arithmetic number, because the mean of its divisors is an integer number (7816320).

Almost surely, 2^81872914 is an apocalyptic number.

81872914 is a deficient number, since it is larger than the sum of its proper divisors (43188206).

81872914 is a wasteful number, since it uses less digits than its factorization.

81872914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985.

The product of its digits is 32256, while the sum is 40.

The square root of 81872914 is about 9048.3652667208. The cubic root of 81872914 is about 434.2235923769.

The spelling of 81872914 in words is "eighty-one million, eight hundred seventy-two thousand, nine hundred fourteen".