81875264 has 28 divisors (see below), whose sum is σ = 172030644. Its totient is φ = 38529024.

The previous prime is 81875263. The next prime is 81875291. The reversal of 81875264 is 46257818.

It can be written as a sum of positive squares in 2 ways, for example, as 60715264 + 21160000 = 7792^2 + 4600^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81875263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36539 + ... + 38714.

Almost surely, 2^81875264 is an apocalyptic number.

It is an amenable number.

81875264 is an abundant number, since it is smaller than the sum of its proper divisors (90155380).

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

81875264 is a wasteful number, since it uses less digits than its factorization.

81875264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75282 (or 75272 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 81875264 is about 9048.4951234998. The cubic root of 81875264 is about 434.2277468468.

The spelling of 81875264 in words is "eighty-one million, eight hundred seventy-five thousand, two hundred sixty-four".