63978560 has 28 divisors (see below), whose sum is σ = 152349708. Its totient is φ = 25591296.

The previous prime is 63978559. The next prime is 63978623. The reversal of 63978560 is 6587936.

It can be written as a sum of positive squares in 2 ways, for example, as 10863616 + 53114944 = 3296^2 + 7288^2 .

It is a super-2 number, since 2×63978560² = 8186512279347200, which contains 22 as substring.

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, 99647 + ... + 100286.

It is an arithmetic number, because the mean of its divisors is an integer number (5441061).

Almost surely, 2^63978560 is an apocalyptic number.

It is an amenable number.

63978560 is an abundant number, since it is smaller than the sum of its proper divisors (88371148).

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

63978560 is a wasteful number, since it uses less digits than its factorization.

63978560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199950 (or 199940 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 63978560 is about 7998.6598877562. The cubic root of 63978560 is about 399.9553283446.

The spelling of 63978560 in words is "sixty-three million, nine hundred seventy-eight thousand, five hundred sixty".