64137500 has 72 divisors (see below), whose sum is σ = 160552224. Its totient is φ = 21960000.

The previous prime is 64137449. The next prime is 64137511. The reversal of 64137500 is 573146.

64137500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64137500² = 8227237812500000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64137500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87134 + ... + 87866.

It is an arithmetic number, because the mean of its divisors is an integer number (2229892).

Almost surely, 2^64137500 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 64137500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80276112).

64137500 is an abundant number, since it is smaller than the sum of its proper divisors (96414724).

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

64137500 is an equidigital number, since it uses as much as digits as its factorization.

64137500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 64137500 is about 8008.5891391680. The cubic root of 64137500 is about 400.2862534319.

The spelling of 64137500 in words is "sixty-four million, one hundred thirty-seven thousand, five hundred".