63640530 has 24 divisors (see below), whose sum is σ = 165465612. Its totient is φ = 16970784.

The previous prime is 63640483. The next prime is 63640531. The reversal of 63640530 is 3504636.

It can be written as a sum of positive squares in 2 ways, for example, as 63345681 + 294849 = 7959^2 + 543^2 .

It is a junction number, because it is equal to n+sod(n) for n = 63640494 and 63640503.

It is not an unprimeable number, because it can be changed into a prime (63640531) 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, 353469 + ... + 353648.

Almost surely, 2^63640530 is an apocalyptic number.

63640530 is an abundant number, since it is smaller than the sum of its proper divisors (101825082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63640530 is a wasteful number, since it uses less digits than its factorization.

63640530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707130 (or 707127 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 63640530 is about 7977.5014885614. The cubic root of 63640530 is about 399.2496976626.

The spelling of 63640530 in words is "sixty-three million, six hundred forty thousand, five hundred thirty".