63755021 has 12 divisors (see below), whose sum is σ = 72498300. Its totient is φ = 55957440.

The previous prime is 63754973. The next prime is 63755059. The reversal of 63755021 is 12055736.

It can be written as a sum of positive squares in 2 ways, for example, as 20340100 + 43414921 = 4510^2 + 6589^2 .

It is not a de Polignac number, because 63755021 - 2¹⁴ = 63738637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63755071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5576 + ... + 12593.

It is an arithmetic number, because the mean of its divisors is an integer number (6041525).

Almost surely, 2^63755021 is an apocalyptic number.

It is an amenable number.

63755021 is a deficient number, since it is larger than the sum of its proper divisors (8743279).

63755021 is a wasteful number, since it uses less digits than its factorization.

63755021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18220 (or 18209 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 63755021 is about 7984.6741323613. The cubic root of 63755021 is about 399.4889744937.

The spelling of 63755021 in words is "sixty-three million, seven hundred fifty-five thousand, twenty-one".