64521925 has 12 divisors (see below), whose sum is σ = 86162020. Its totient is φ = 47646720.

The previous prime is 64521911. The next prime is 64521937. The reversal of 64521925 is 52912546.

It is a happy number.

64521925 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 4397409 + 60124516 = 2097^2 + 7754^2 .

It is not a de Polignac number, because 64521925 - 2⁵ = 64521893 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 98940 + ... + 99589.

Almost surely, 2^64521925 is an apocalyptic number.

64521925 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64521925 is a deficient number, since it is larger than the sum of its proper divisors (21640095).

64521925 is a wasteful number, since it uses less digits than its factorization.

64521925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198552 (or 198547 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 64521925 is about 8032.5540770044. The cubic root of 64521925 is about 401.0844012781.

The spelling of 64521925 in words is "sixty-four million, five hundred twenty-one thousand, nine hundred twenty-five".