63553640 has 16 divisors (see below), whose sum is σ = 142995780. Its totient is φ = 25421440.

The previous prime is 63553631. The next prime is 63553657. The reversal of 63553640 is 4635536.

It can be written as a sum of positive squares in 2 ways, for example, as 62948356 + 605284 = 7934^2 + 778^2 .

It is a junction number, because it is equal to n+sod(n) for n = 63553597 and 63553606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794381 + ... + 794460.

Almost surely, 2^63553640 is an apocalyptic number.

It is an amenable number.

63553640 is an abundant number, since it is smaller than the sum of its proper divisors (79442140).

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

63553640 is a wasteful number, since it uses less digits than its factorization.

63553640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588852 (or 1588848 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 32.

The square root of 63553640 is about 7972.0536877269. The cubic root of 63553640 is about 399.0679130552.

The spelling of 63553640 in words is "sixty-three million, five hundred fifty-three thousand, six hundred forty".