63990405 has 24 divisors (see below), whose sum is σ = 115026912. Its totient is φ = 34127568.

The previous prime is 63990391. The next prime is 63990467. The reversal of 63990405 is 50409936.

It is not a de Polignac number, because 63990405 - 2⁵ = 63990373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63990405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25119 + ... + 27548.

It is an arithmetic number, because the mean of its divisors is an integer number (4792788).

Almost surely, 2^63990405 is an apocalyptic number.

It is an amenable number.

63990405 is a deficient number, since it is larger than the sum of its proper divisors (51036507).

63990405 is an equidigital number, since it uses as much as digits as its factorization.

63990405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52687 (or 52675 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 63990405 is about 7999.4002900217. The cubic root of 63990405 is about 399.9800094176.

The spelling of 63990405 in words is "sixty-three million, nine hundred ninety thousand, four hundred five".