63881556 has 12 divisors (see below), whose sum is σ = 149056992. Its totient is φ = 21293848.

The previous prime is 63881549. The next prime is 63881561. The reversal of 63881556 is 65518836.

63881556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×63881556² = 8161706393962272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2661720 + ... + 2661743.

It is an arithmetic number, because the mean of its divisors is an integer number (12421416).

Almost surely, 2^63881556 is an apocalyptic number.

It is an amenable number.

63881556 is an abundant number, since it is smaller than the sum of its proper divisors (85175436).

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

63881556 is a wasteful number, since it uses less digits than its factorization.

63881556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5323470 (or 5323468 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 63881556 is about 7992.5938217828. The cubic root of 63881556 is about 399.7530892858.

The spelling of 63881556 in words is "sixty-three million, eight hundred eighty-one thousand, five hundred fifty-six".