564821866400 has 72 divisors (see below), whose sum is σ = 1504223348544. Its totient is φ = 205389766400.

The previous prime is 564821866397. The next prime is 564821866439. The reversal of 564821866400 is 4668128465.

It is a Harshad number since it is a multiple of its sum of digits (50).

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, 32083352 + ... + 32100951.

It is an arithmetic number, because the mean of its divisors is an integer number (20891990952).

Almost surely, 2^564821866400 is an apocalyptic number.

564821866400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

564821866400 is an abundant number, since it is smaller than the sum of its proper divisors (939401482144).

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

564821866400 is a wasteful number, since it uses less digits than its factorization.

564821866400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64184334 (or 64184321 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 50.

The spelling of 564821866400 in words is "five hundred sixty-four billion, eight hundred twenty-one million, eight hundred sixty-six thousand, four hundred".