63640525 has 12 divisors (see below), whose sum is σ = 84985012. Its totient is φ = 46995840.

The previous prime is 63640483. The next prime is 63640531. The reversal of 63640525 is 52504636.

It can be written as a sum of positive squares in 6 ways, for example, as 6456681 + 57183844 = 2541^2 + 7562^2 .

It is not a de Polignac number, because 63640525 - 2²¹ = 61543373 is a prime.

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, 97584 + ... + 98233.

Almost surely, 2^63640525 is an apocalyptic number.

63640525 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

63640525 is a deficient number, since it is larger than the sum of its proper divisors (21344487).

63640525 is a wasteful number, since it uses less digits than its factorization.

63640525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195840 (or 195835 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 63640525 is about 7977.5011751801. The cubic root of 63640525 is about 399.2496872068.

The spelling of 63640525 in words is "sixty-three million, six hundred forty thousand, five hundred twenty-five".