16563840 has 64 divisors (see below), whose sum is σ = 52803360. Its totient is φ = 4416512.

The previous prime is 16563829. The next prime is 16563857. The reversal of 16563840 is 4836561.

It is a tau number, because it is divible by the number of its divisors (64).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2394 + ... + 6233.

Almost surely, 2^16563840 is an apocalyptic number.

16563840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16563840 is an abundant number, since it is smaller than the sum of its proper divisors (36239520).

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

16563840 is an equidigital number, since it uses as much as digits as its factorization.

16563840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8649 (or 8637 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 16563840 is about 4069.8697767865. The cubic root of 16563840 is about 254.9100797909.

The spelling of 16563840 in words is "sixteen million, five hundred sixty-three thousand, eight hundred forty".