81814264 has 32 divisors (see below), whose sum is σ = 176411520. Its totient is φ = 34844256.

The previous prime is 81814253. The next prime is 81814267. The reversal of 81814264 is 46241818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81814267) 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, 4647 + ... + 13609.

It is an arithmetic number, because the mean of its divisors is an integer number (5512860).

Almost surely, 2^81814264 is an apocalyptic number.

It is an amenable number.

81814264 is an abundant number, since it is smaller than the sum of its proper divisors (94597256).

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

81814264 is a wasteful number, since it uses less digits than its factorization.

81814264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9139 (or 9135 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 81814264 is about 9045.1237691919. The cubic root of 81814264 is about 434.1198816540.

The spelling of 81814264 in words is "eighty-one million, eight hundred fourteen thousand, two hundred sixty-four".