64436725 has 12 divisors (see below), whose sum is σ = 80415364. Its totient is φ = 51217920.

The previous prime is 64436719. The next prime is 64436737. The reversal of 64436725 is 52763446.

It can be written as a sum of positive squares in 6 ways, for example, as 8814961 + 55621764 = 2969^2 + 7458^2 .

It is not a de Polignac number, because 64436725 - 2⁹ = 64436213 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4284 + ... + 12133.

Almost surely, 2^64436725 is an apocalyptic number.

It is an amenable number.

64436725 is a deficient number, since it is larger than the sum of its proper divisors (15978639).

64436725 is a wasteful number, since it uses less digits than its factorization.

64436725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16584 (or 16579 counting only the distinct ones).

The product of its digits is 120960, while the sum is 37.

The square root of 64436725 is about 8027.2489060699. The cubic root of 64436725 is about 400.9077820210.

The spelling of 64436725 in words is "sixty-four million, four hundred thirty-six thousand, seven hundred twenty-five".