63421904 has 80 divisors (see below), whose sum is σ = 154906752. Its totient is φ = 24482304.

The previous prime is 63421903. The next prime is 63421913. The reversal of 63421904 is 40912436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63421903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62102 + ... + 63114.

Almost surely, 2^63421904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63421904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77453376).

63421904 is an abundant number, since it is smaller than the sum of its proper divisors (91484848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63421904 is a wasteful number, since it uses less digits than its factorization.

63421904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 63421904 is about 7963.7870388403. The cubic root of 63421904 is about 398.7919887781.

The spelling of 63421904 in words is "sixty-three million, four hundred twenty-one thousand, nine hundred four".