64736725 has 6 divisors (see below), whose sum is σ = 80273570. Its totient is φ = 51789360.

The previous prime is 64736723. The next prime is 64736741. The reversal of 64736725 is 52763746.

It can be written as a sum of positive squares in 3 ways, for example, as 1343281 + 63393444 = 1159^2 + 7962^2 .

It is not a de Polignac number, because 64736725 - 2¹ = 64736723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64736723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1294710 + ... + 1294759.

Almost surely, 2^64736725 is an apocalyptic number.

It is an amenable number.

64736725 is a deficient number, since it is larger than the sum of its proper divisors (15536845).

64736725 is a wasteful number, since it uses less digits than its factorization.

64736725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589479 (or 2589474 counting only the distinct ones).

The product of its digits is 211680, while the sum is 40.

The square root of 64736725 is about 8045.9135590684. The cubic root of 64736725 is about 401.5289917636.

The spelling of 64736725 in words is "sixty-four million, seven hundred thirty-six thousand, seven hundred twenty-five".