81497160 has 48 divisors (see below), whose sum is σ = 264866940. Its totient is φ = 21732480.

The previous prime is 81497153. The next prime is 81497177. The reversal of 81497160 is 6179418.

81497160 is a `hidden beast` number, since 8 + 1 + 497 + 160 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 80676324 + 820836 = 8982^2 + 906^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 112831 + ... + 113550.

Almost surely, 2^81497160 is an apocalyptic number.

It is an amenable number.

81497160 is an abundant number, since it is smaller than the sum of its proper divisors (183369780).

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

81497160 is a wasteful number, since it uses less digits than its factorization.

81497160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226398 (or 226391 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 81497160 is about 9027.5777482113. The cubic root of 81497160 is about 433.5582868829.

The spelling of 81497160 in words is "eighty-one million, four hundred ninety-seven thousand, one hundred sixty".