63957621 has 32 divisors (see below), whose sum is σ = 111138048. Its totient is φ = 31749120.

The previous prime is 63957613. The next prime is 63957623. The reversal of 63957621 is 12675936.

It is not a de Polignac number, because 63957621 - 2³ = 63957613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 63957621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63957623) 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, 2250 + ... + 11531.

It is an arithmetic number, because the mean of its divisors is an integer number (3473064).

Almost surely, 2^63957621 is an apocalyptic number.

It is an amenable number.

63957621 is a deficient number, since it is larger than the sum of its proper divisors (47180427).

63957621 is a wasteful number, since it uses less digits than its factorization.

63957621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13821.

The product of its digits is 68040, while the sum is 39.

The square root of 63957621 is about 7997.3508738832. The cubic root of 63957621 is about 399.9116909219.

The spelling of 63957621 in words is "sixty-three million, nine hundred fifty-seven thousand, six hundred twenty-one".