64563900 has 144 divisors (see below), whose sum is σ = 201653760. Its totient is φ = 15897600.

The previous prime is 64563887. The next prime is 64563913. The reversal of 64563900 is 936546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64563887) and next prime (64563913).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 267780 + ... + 268020.

Almost surely, 2^64563900 is an apocalyptic number.

64563900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64563900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100826880).

64563900 is an abundant number, since it is smaller than the sum of its proper divisors (137089860).

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

64563900 is a wasteful number, since it uses less digits than its factorization.

64563900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 64563900 is about 8035.1664575166. The cubic root of 64563900 is about 401.1713581187.

The spelling of 64563900 in words is "sixty-four million, five hundred sixty-three thousand, nine hundred".