63881988 has 24 divisors (see below), whose sum is σ = 157826592. Its totient is φ = 20041344.

The previous prime is 63881981. The next prime is 63882011. The reversal of 63881988 is 88918836.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 63881988.

It is not an unprimeable number, because it can be changed into a prime (63881981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156370 + ... + 156777.

It is an arithmetic number, because the mean of its divisors is an integer number (6576108).

Almost surely, 2^63881988 is an apocalyptic number.

63881988 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

63881988 is an abundant number, since it is smaller than the sum of its proper divisors (93944604).

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

63881988 is a wasteful number, since it uses less digits than its factorization.

63881988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313171 (or 313169 counting only the distinct ones).

The product of its digits is 663552, while the sum is 51.

The square root of 63881988 is about 7992.6208467561. The cubic root of 63881988 is about 399.7539903959.

The spelling of 63881988 in words is "sixty-three million, eight hundred eighty-one thousand, nine hundred eighty-eight".