63640025 has 12 divisors (see below), whose sum is σ = 83067600. Its totient is φ = 48232080.

The previous prime is 63639997. The next prime is 63640033. The reversal of 63640025 is 52004636.

It is not a de Polignac number, because 63640025 - 2⁸ = 63639769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63639976 and 63640003.

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, 66515 + ... + 67464.

It is an arithmetic number, because the mean of its divisors is an integer number (6922300).

Almost surely, 2^63640025 is an apocalyptic number.

It is an amenable number.

63640025 is a deficient number, since it is larger than the sum of its proper divisors (19427575).

63640025 is a wasteful number, since it uses less digits than its factorization.

63640025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134008 (or 134003 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 63640025 is about 7977.4698369847. The cubic root of 63640025 is about 399.2486416185.

The spelling of 63640025 in words is "sixty-three million, six hundred forty thousand, twenty-five".