81512862 has 16 divisors (see below), whose sum is σ = 163710720. Its totient is φ = 27056792.

The previous prime is 81512833. The next prime is 81512891. The reversal of 81512862 is 26821518.

It is an interprime number because it is at equal distance from previous prime (81512833) and next prime (81512891).

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, 26988 + ... + 29855.

It is an arithmetic number, because the mean of its divisors is an integer number (10231920).

Almost surely, 2^81512862 is an apocalyptic number.

81512862 is an abundant number, since it is smaller than the sum of its proper divisors (82197858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81512862 is a wasteful number, since it uses less digits than its factorization.

81512862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57087.

The product of its digits is 7680, while the sum is 33.

The square root of 81512862 is about 9028.4473748259. The cubic root of 81512862 is about 433.5861295507.

The spelling of 81512862 in words is "eighty-one million, five hundred twelve thousand, eight hundred sixty-two".