63875920 has 40 divisors (see below), whose sum is σ = 149704704. Its totient is φ = 25345152.

The previous prime is 63875881. The next prime is 63875927. The reversal of 63875920 is 2957836.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63875927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7017 + ... + 13303.

Almost surely, 2^63875920 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 63875920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74852352).

63875920 is an abundant number, since it is smaller than the sum of its proper divisors (85828784).

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

63875920 is a wasteful number, since it uses less digits than its factorization.

63875920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6427 (or 6421 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 63875920 is about 7992.2412376004. The cubic root of 63875920 is about 399.7413327642.

The spelling of 63875920 in words is "sixty-three million, eight hundred seventy-five thousand, nine hundred twenty".