63899388 has 48 divisors (see below), whose sum is σ = 189333760. Its totient is φ = 18256752.

The previous prime is 63899371. The next prime is 63899389. The reversal of 63899388 is 88399836.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63899389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41506 + ... + 43017.

Almost surely, 2^63899388 is an apocalyptic number.

It is an amenable number.

63899388 is an abundant number, since it is smaller than the sum of its proper divisors (125434372).

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

63899388 is a wasteful number, since it uses less digits than its factorization.

63899388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84543 (or 84535 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 63899388 is about 7993.7092766750. The cubic root of 63899388 is about 399.7902817315.

The spelling of 63899388 in words is "sixty-three million, eight hundred ninety-nine thousand, three hundred eighty-eight".