64812500 has 84 divisors (see below), whose sum is σ = 152576172. Its totient is φ = 24000000.

The previous prime is 64812463. The next prime is 64812511. The reversal of 64812500 is 521846.

It can be written as a sum of positive squares in 14 ways, for example, as 45346756 + 19465744 = 6734^2 + 4412^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64812500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1062470 + ... + 1062530.

It is an arithmetic number, because the mean of its divisors is an integer number (1816383).

Almost surely, 2^64812500 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 64812500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76288086).

64812500 is an abundant number, since it is smaller than the sum of its proper divisors (87763672).

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

64812500 is an equidigital number, since it uses as much as digits as its factorization.

64812500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 64812500 is about 8050.6210940523. The cubic root of 64812500 is about 401.6855952773.

The spelling of 64812500 in words is "sixty-four million, eight hundred twelve thousand, five hundred".