64660500 has 72 divisors (see below), whose sum is σ = 203996520. Its totient is φ = 17241600.

The previous prime is 64660493. The next prime is 64660501. The reversal of 64660500 is 506646.

It can be written as a sum of positive squares in 4 ways, for example, as 1648656 + 63011844 = 1284^2 + 7938^2 .

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64660501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2685 + ... + 11684.

It is an arithmetic number, because the mean of its divisors is an integer number (2833285).

Almost surely, 2^64660500 is an apocalyptic number.

64660500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64660500 is an abundant number, since it is smaller than the sum of its proper divisors (139336020).

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

64660500 is a wasteful number, since it uses less digits than its factorization.

64660500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14394 (or 14379 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 64660500 is about 8041.1752872326. The cubic root of 64660500 is about 401.3713348955.

The spelling of 64660500 in words is "sixty-four million, six hundred sixty thousand, five hundred".