64636225 has 12 divisors (see below), whose sum is σ = 82316284. Its totient is φ = 50310720.

The previous prime is 64636223. The next prime is 64636259. The reversal of 64636225 is 52263646.

It can be written as a sum of positive squares in 6 ways, for example, as 3655744 + 60980481 = 1912^2 + 7809^2 .

It is not a de Polignac number, because 64636225 - 2¹ = 64636223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64636223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34014 + ... + 35863.

Almost surely, 2^64636225 is an apocalyptic number.

It is an amenable number.

64636225 is a deficient number, since it is larger than the sum of its proper divisors (17680059).

64636225 is a wasteful number, since it uses less digits than its factorization.

64636225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69924 (or 69919 counting only the distinct ones).

The product of its digits is 51840, while the sum is 34.

The square root of 64636225 is about 8039.6657268819. The cubic root of 64636225 is about 401.3211006789.

The spelling of 64636225 in words is "sixty-four million, six hundred thirty-six thousand, two hundred twenty-five".