63995778 has 64 divisors (see below), whose sum is σ = 177315840. Its totient is φ = 16621200.

The previous prime is 63995777. The next prime is 63995791. The reversal of 63995778 is 87759936.

63995778 is a `hidden beast` number, since 63 + 9 + 9 + 577 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (63995773) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3538 + ... + 11853.

It is an arithmetic number, because the mean of its divisors is an integer number (2770560).

Almost surely, 2^63995778 is an apocalyptic number.

63995778 is an abundant number, since it is smaller than the sum of its proper divisors (113320062).

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

63995778 is a wasteful number, since it uses less digits than its factorization.

63995778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15420 (or 15414 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 63995778 is about 7999.7361206480. The cubic root of 63995778 is about 399.9912039732.

The spelling of 63995778 in words is "sixty-three million, nine hundred ninety-five thousand, seven hundred seventy-eight".