64633620 has 24 divisors (see below), whose sum is σ = 180974304. Its totient is φ = 17235616.

The previous prime is 64633607. The next prime is 64633693. The reversal of 64633620 is 2633646.

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

It is a congruent number.

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, 538554 + ... + 538673.

It is an arithmetic number, because the mean of its divisors is an integer number (7540596).

Almost surely, 2^64633620 is an apocalyptic number.

64633620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64633620 is an abundant number, since it is smaller than the sum of its proper divisors (116340684).

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

64633620 is a wasteful number, since it uses less digits than its factorization.

64633620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077239 (or 1077237 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 30.

The square root of 64633620 is about 8039.5037160263. The cubic root of 64633620 is about 401.3157091949.

The spelling of 64633620 in words is "sixty-four million, six hundred thirty-three thousand, six hundred twenty".