64507136 has 36 divisors (see below), whose sum is σ = 133217700. Its totient is φ = 31137792.

The previous prime is 64507127. The next prime is 64507139. The reversal of 64507136 is 63170546.

It can be written as a sum of positive squares in 2 ways, for example, as 47334400 + 17172736 = 6880^2 + 4144^2 .

It is a super-2 number, since 2×64507136² = 8322341189844992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64507139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3080 + ... + 11768.

Almost surely, 2^64507136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64507136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66608850).

64507136 is an abundant number, since it is smaller than the sum of its proper divisors (68710564).

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

64507136 is an equidigital number, since it uses as much as digits as its factorization.

64507136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8734 (or 8720 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 64507136 is about 8031.6334577718. The cubic root of 64507136 is about 401.0537548972.

The spelling of 64507136 in words is "sixty-four million, five hundred seven thousand, one hundred thirty-six".