631401420 has 144 divisors (see below), whose sum is σ = 2023223328. Its totient is φ = 146227200.

The previous prime is 631401413. The next prime is 631401439. The reversal of 631401420 is 24104136.

631401420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 224020 + ... + 226820.

It is an arithmetic number, because the mean of its divisors is an integer number (14050162).

Almost surely, 2^631401420 is an apocalyptic number.

631401420 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 631401420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1011611664).

631401420 is an abundant number, since it is smaller than the sum of its proper divisors (1391821908).

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

631401420 is a wasteful number, since it uses less digits than its factorization.

631401420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860 (or 2841 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 631401420 is about 25127.7022427440. The cubic root of 631401420 is about 857.8970703678.

Adding to 631401420 its reverse (24104136), we get a palindrome (655505556).

The spelling of 631401420 in words is "six hundred thirty-one million, four hundred one thousand, four hundred twenty".