63431990 has 32 divisors (see below), whose sum is σ = 120372480. Its totient is φ = 24029824.

The previous prime is 63431987. The next prime is 63432001. The reversal of 63431990 is 9913436.

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 63431990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13307 + ... + 17433.

It is an arithmetic number, because the mean of its divisors is an integer number (3761640).

Almost surely, 2^63431990 is an apocalyptic number.

63431990 is a deficient number, since it is larger than the sum of its proper divisors (56940490).

63431990 is a wasteful number, since it uses less digits than its factorization.

63431990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 63431990 is about 7964.4202551096. The cubic root of 63431990 is about 398.8131276515.

The spelling of 63431990 in words is "sixty-three million, four hundred thirty-one thousand, nine hundred ninety".