81895560 has 32 divisors (see below), whose sum is σ = 245687040. Its totient is φ = 21838784.

The previous prime is 81895559. The next prime is 81895577. The reversal of 81895560 is 6559818.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341112 + ... + 341351.

It is an arithmetic number, because the mean of its divisors is an integer number (7677720).

Almost surely, 2^81895560 is an apocalyptic number.

It is an amenable number.

81895560 is an abundant number, since it is smaller than the sum of its proper divisors (163791480).

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

81895560 is a wasteful number, since it uses less digits than its factorization.

81895560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682477 (or 682473 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 81895560 is about 9049.6165664629. The cubic root of 81895560 is about 434.2636240165.

The spelling of 81895560 in words is "eighty-one million, eight hundred ninety-five thousand, five hundred sixty".