63640625 has 14 divisors (see below), whose sum is σ = 79569294. Its totient is φ = 50900000.

The previous prime is 63640573. The next prime is 63640663. The reversal of 63640625 is 52604636.

It can be written as a sum of positive squares in 7 ways, for example, as 59474944 + 4165681 = 7712^2 + 2041^2 .

It is not a de Polignac number, because 63640625 - 2⁶ = 63640561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63640591 and 63640600.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 13589 + ... + 17661.

It is an arithmetic number, because the mean of its divisors is an integer number (5683521).

Almost surely, 2^63640625 is an apocalyptic number.

It is an amenable number.

63640625 is a deficient number, since it is larger than the sum of its proper divisors (15928669).

63640625 is an frugal number, since it uses more digits than its factorization.

63640625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103 (or 4078 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 63640625 is about 7977.5074428044. The cubic root of 63640625 is about 399.2498963238.

The spelling of 63640625 in words is "sixty-three million, six hundred forty thousand, six hundred twenty-five".