63999957 has 8 divisors (see below), whose sum is σ = 97523776. Its totient is φ = 36571392.

The previous prime is 63999937. The next prime is 63999967. The reversal of 63999957 is 75999936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63999957 - 2⁷ = 63999829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63999897 and 63999906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63999907) 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, 1523788 + ... + 1523829.

It is an arithmetic number, because the mean of its divisors is an integer number (12190472).

Almost surely, 2^63999957 is an apocalyptic number.

It is an amenable number.

63999957 is a deficient number, since it is larger than the sum of its proper divisors (33523819).

63999957 is a wasteful number, since it uses less digits than its factorization.

63999957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047627.

The product of its digits is 4133430, while the sum is 57.

The square root of 63999957 is about 7999.9973124995. The cubic root of 63999957 is about 399.9999104166. Note that the first 4 decimals are identical.

The spelling of 63999957 in words is "sixty-three million, nine hundred ninety-nine thousand, nine hundred fifty-seven".