63621857 has 8 divisors (see below), whose sum is σ = 68772480. Its totient is φ = 58507920.

The previous prime is 63621851. The next prime is 63621869. The reversal of 63621857 is 75812636.

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

It is a cyclic number.

It is not a de Polignac number, because 63621857 - 2²² = 59427553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63621857.

It is not an unprimeable number, because it can be changed into a prime (63621851) 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, 5507 + ... + 12552.

It is an arithmetic number, because the mean of its divisors is an integer number (8596560).

Almost surely, 2^63621857 is an apocalyptic number.

It is an amenable number.

63621857 is a deficient number, since it is larger than the sum of its proper divisors (5150623).

63621857 is a wasteful number, since it uses less digits than its factorization.

63621857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18343.

The product of its digits is 60480, while the sum is 38.

The square root of 63621857 is about 7976.3310487968. The cubic root of 63621857 is about 399.2106454063.

The spelling of 63621857 in words is "sixty-three million, six hundred twenty-one thousand, eight hundred fifty-seven".