81452900 has 36 divisors (see below), whose sum is σ = 177350628. Its totient is φ = 32471040.

The previous prime is 81452869. The next prime is 81452911. The reversal of 81452900 is 925418.

It can be written as a sum of positive squares in 6 ways, for example, as 200704 + 81252196 = 448^2 + 9014^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32492 + ... + 34908.

Almost surely, 2^81452900 is an apocalyptic number.

It is an amenable number.

81452900 is an abundant number, since it is smaller than the sum of its proper divisors (95897728).

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

81452900 is a wasteful number, since it uses less digits than its factorization.

81452900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768 (or 2761 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 81452900 is about 9025.1260379011. The cubic root of 81452900 is about 433.4797861325.

The spelling of 81452900 in words is "eighty-one million, four hundred fifty-two thousand, nine hundred".