64312500 has 168 divisors, whose sum is σ = 218747200. Its totient is φ = 14700000.

The previous prime is 64312487. The next prime is 64312519. The reversal of 64312500 is 521346.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 9187497 + ... + 9187503.

Almost surely, 2^64312500 is an apocalyptic number.

64312500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64312500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109373600).

64312500 is an abundant number, since it is smaller than the sum of its proper divisors (154434700).

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

64312500 is an frugal number, since it uses more digits than its factorization.

64312500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 64312500 is about 8019.5074661727. The cubic root of 64312500 is about 400.6499848937.

Multiplying 64312500 by its sum of digits (21), we get a square (1350562500 = 36750²).

64312500 divided by its sum of digits (21) gives a square (3062500 = 1750²).

Adding to 64312500 its reverse (521346), we get a palindrome (64833846).

The spelling of 64312500 in words is "sixty-four million, three hundred twelve thousand, five hundred".