64899136 has 63 divisors (see below), whose sum is σ = 138531981. Its totient is φ = 30161664.

The previous prime is 64899113. The next prime is 64899143. The reversal of 64899136 is 63199846.

The square root of 64899136 is 8056.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 46785600 + 18113536 = 6840^2 + 4256^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1224486 + ... + 1224538.

Almost surely, 2^64899136 is an apocalyptic number.

64899136 is the 8056-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64899136

64899136 is an abundant number, since it is smaller than the sum of its proper divisors (73632845).

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

64899136 is an equidigital number, since it uses as much as digits as its factorization.

64899136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 74 counting only the distinct ones).

The product of its digits is 279936, while the sum is 46.

The cubic root of 64899136 is about 401.8644956367.

It can be divided in two parts, 6489 and 9136, that added together give a 6-th power (15625 = 5⁶).

The spelling of 64899136 in words is "sixty-four million, eight hundred ninety-nine thousand, one hundred thirty-six".