81325476 has 18 divisors (see below), whose sum is σ = 205572822. Its totient is φ = 27108480.

The previous prime is 81325469. The next prime is 81325499. The reversal of 81325476 is 67452318.

81325476 is a `hidden beast` number, since 81 + 32 + 547 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 80568576 + 756900 = 8976^2 + 870^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×81325476² = 13227666093253152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2259041 = 81325476 / (8 + 1 + 3 + 2 + 5 + 4 + 7 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 81325476.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1129485 + ... + 1129556.

Almost surely, 2^81325476 is an apocalyptic number.

It is an amenable number.

81325476 is an abundant number, since it is smaller than the sum of its proper divisors (124247346).

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

81325476 is a wasteful number, since it uses less digits than its factorization.

81325476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259051 (or 2259046 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 81325476 is about 9018.0638720293. The cubic root of 81325476 is about 433.2536245237.

The spelling of 81325476 in words is "eighty-one million, three hundred twenty-five thousand, four hundred seventy-six".