63421440 has 88 divisors (see below), whose sum is σ = 202898640. Its totient is φ = 16908288.

The previous prime is 63421439. The next prime is 63421453. The reversal of 63421440 is 4412436.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 63421440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13296 + ... + 17424.

Almost surely, 2^63421440 is an apocalyptic number.

63421440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101449320).

63421440 is an abundant number, since it is smaller than the sum of its proper divisors (139477200).

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

63421440 is a wasteful number, since it uses less digits than its factorization.

63421440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157 (or 4139 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 63421440 is about 7963.7579069181. The cubic root of 63421440 is about 398.7910162438.

Adding to 63421440 its reverse (4412436), we get a palindrome (67833876).

The spelling of 63421440 in words is "sixty-three million, four hundred twenty-one thousand, four hundred forty".