63981980 has 12 divisors (see below), whose sum is σ = 134362200. Its totient is φ = 25592784.

The previous prime is 63981947. The next prime is 63981989. The reversal of 63981980 is 8918936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63981989) 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, 1599530 + ... + 1599569.

It is an arithmetic number, because the mean of its divisors is an integer number (11196850).

Almost surely, 2^63981980 is an apocalyptic number.

It is an amenable number.

63981980 is an abundant number, since it is smaller than the sum of its proper divisors (70380220).

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

63981980 is a wasteful number, since it uses less digits than its factorization.

63981980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3199108 (or 3199106 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 63981980 is about 7998.8736707114. The cubic root of 63981980 is about 399.9624548093.

The spelling of 63981980 in words is "sixty-three million, nine hundred eighty-one thousand, nine hundred eighty".