63809980 has 48 divisors (see below), whose sum is σ = 151915680. Its totient is φ = 22318848.

The previous prime is 63809971. The next prime is 63809989. The reversal of 63809980 is 8990836.

It is an interprime number because it is at equal distance from previous prime (63809971) and next prime (63809989).

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63809989) 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, 1519 + ... + 11398.

It is an arithmetic number, because the mean of its divisors is an integer number (3164910).

Almost surely, 2^63809980 is an apocalyptic number.

It is an amenable number.

63809980 is an abundant number, since it is smaller than the sum of its proper divisors (88105700).

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

63809980 is a wasteful number, since it uses less digits than its factorization.

63809980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12958 (or 12956 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 63809980 is about 7988.1149215569. The cubic root of 63809980 is about 399.6037325599.

The spelling of 63809980 in words is "sixty-three million, eight hundred nine thousand, nine hundred eighty".