64636506 has 72 divisors (see below), whose sum is σ = 156854880. Its totient is φ = 19216560.

The previous prime is 64636493. The next prime is 64636543. The reversal of 64636506 is 60563646.

64636506 is a `hidden beast` number, since 646 + 3 + 6 + 5 + 0 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 128251 + ... + 128753.

It is an arithmetic number, because the mean of its divisors is an integer number (2178540).

Almost surely, 2^64636506 is an apocalyptic number.

64636506 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 64636506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78427440).

64636506 is an abundant number, since it is smaller than the sum of its proper divisors (92218374).

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

64636506 is a wasteful number, since it uses less digits than its factorization.

64636506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 64636506 is about 8039.6832027139. The cubic root of 64636506 is about 401.3216822468.

The spelling of 64636506 in words is "sixty-four million, six hundred thirty-six thousand, five hundred six".