63977856 has 32 divisors (see below), whose sum is σ = 169942200. Its totient is φ = 21325824.

The previous prime is 63977843. The next prime is 63977861. The reversal of 63977856 is 65877936.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 63977799 and 63977808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82921 + ... + 83688.

Almost surely, 2^63977856 is an apocalyptic number.

It is an amenable number.

63977856 is an abundant number, since it is smaller than the sum of its proper divisors (105964344).

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

63977856 is a wasteful number, since it uses less digits than its factorization.

63977856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166626 (or 166614 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 51.

The square root of 63977856 is about 7998.6158802633. The cubic root of 63977856 is about 399.9538613449.

The spelling of 63977856 in words is "sixty-three million, nine hundred seventy-seven thousand, eight hundred fifty-six".