81568200 has 96 divisors (see below), whose sum is σ = 288999360. Its totient is φ = 18643200.

The previous prime is 81568199. The next prime is 81568217. The reversal of 81568200 is 286518.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5511 + ... + 13910.

It is an arithmetic number, because the mean of its divisors is an integer number (3010410).

Almost surely, 2^81568200 is an apocalyptic number.

It is an amenable number.

81568200 is an abundant number, since it is smaller than the sum of its proper divisors (207431160).

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

81568200 is a wasteful number, since it uses less digits than its factorization.

81568200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19447 (or 19438 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 81568200 is about 9031.5115014044. The cubic root of 81568200 is about 433.6842259779.

The spelling of 81568200 in words is "eighty-one million, five hundred sixty-eight thousand, two hundred".