64533620 has 24 divisors (see below), whose sum is σ = 136840704. Its totient is φ = 25562016.

The previous prime is 64533619. The next prime is 64533641. The reversal of 64533620 is 2633546.

It is a super-2 number, since 2×64533620² = 8329176220608800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

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, 13604 + ... + 17723.

It is an arithmetic number, because the mean of its divisors is an integer number (5701696).

Almost surely, 2^64533620 is an apocalyptic number.

It is an amenable number.

64533620 is an abundant number, since it is smaller than the sum of its proper divisors (72307084).

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

64533620 is a wasteful number, since it uses less digits than its factorization.

64533620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31439 (or 31437 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 64533620 is about 8033.2820191999. The cubic root of 64533620 is about 401.1086328278.

The spelling of 64533620 in words is "sixty-four million, five hundred thirty-three thousand, six hundred twenty".