63991760 has 80 divisors (see below), whose sum is σ = 171120000. Its totient is φ = 21800448.

The previous prime is 63991751. The next prime is 63991831. The reversal of 63991760 is 6719936.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127991 + ... + 128489.

It is an arithmetic number, because the mean of its divisors is an integer number (2139000).

Almost surely, 2^63991760 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63991760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85560000).

63991760 is an abundant number, since it is smaller than the sum of its proper divisors (107128240).

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

63991760 is a wasteful number, since it uses less digits than its factorization.

63991760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 63991760 is about 7999.4849834224. The cubic root of 63991760 is about 399.9828325965.

The spelling of 63991760 in words is "sixty-three million, nine hundred ninety-one thousand, seven hundred sixty".