63821980 has 12 divisors (see below), whose sum is σ = 134026200. Its totient is φ = 25528784.

The previous prime is 63821977. The next prime is 63821981. The reversal of 63821980 is 8912836.

It is a super-2 number, since 2×63821980² = 8146490262240800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63821981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1595530 + ... + 1595569.

It is an arithmetic number, because the mean of its divisors is an integer number (11168850).

Almost surely, 2^63821980 is an apocalyptic number.

It is an amenable number.

63821980 is an abundant number, since it is smaller than the sum of its proper divisors (70204220).

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

63821980 is a wasteful number, since it uses less digits than its factorization.

63821980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3191108 (or 3191106 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 63821980 is about 7988.8660021307. The cubic root of 63821980 is about 399.6287805970.

The spelling of 63821980 in words is "sixty-three million, eight hundred twenty-one thousand, nine hundred eighty".