63688820 has 24 divisors (see below), whose sum is σ = 144035304. Its totient is φ = 23515776.

The previous prime is 63688811. The next prime is 63688847. The reversal of 63688820 is 2888636.

It can be written as a sum of positive squares in 4 ways, for example, as 1373584 + 62315236 = 1172^2 + 7894^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122219 + ... + 122738.

It is an arithmetic number, because the mean of its divisors is an integer number (6001471).

Almost surely, 2^63688820 is an apocalyptic number.

It is an amenable number.

63688820 is an abundant number, since it is smaller than the sum of its proper divisors (80346484).

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

63688820 is a wasteful number, since it uses less digits than its factorization.

63688820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244979 (or 244977 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 63688820 is about 7980.5275514843. The cubic root of 63688820 is about 399.3506547807.

The spelling of 63688820 in words is "sixty-three million, six hundred eighty-eight thousand, eight hundred twenty".