81995460 has 48 divisors (see below), whose sum is σ = 239573376. Its totient is φ = 20914432.

The previous prime is 81995447. The next prime is 81995477. The reversal of 81995460 is 6459918.

It is a super-2 number, since 2×81995460² = 13446510921223200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28329 + ... + 31088.

It is an arithmetic number, because the mean of its divisors is an integer number (4991112).

Almost surely, 2^81995460 is an apocalyptic number.

It is an amenable number.

81995460 is an abundant number, since it is smaller than the sum of its proper divisors (157577916).

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

81995460 is a wasteful number, since it uses less digits than its factorization.

81995460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59452 (or 59450 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 81995460 is about 9055.1344551034. The cubic root of 81995460 is about 434.4401305647.

The spelling of 81995460 in words is "eighty-one million, nine hundred ninety-five thousand, four hundred sixty".