631982420 has 24 divisors (see below), whose sum is σ = 1327691400. Its totient is φ = 252692352.

The previous prime is 631982411. The next prime is 631982473. The reversal of 631982420 is 24289136.

It can be written as a sum of positive squares in 4 ways, for example, as 27019204 + 604963216 = 5198^2 + 24596^2 .

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, 64826 + ... + 73934.

It is an arithmetic number, because the mean of its divisors is an integer number (55320475).

Almost surely, 2^631982420 is an apocalyptic number.

It is an amenable number.

631982420 is an abundant number, since it is smaller than the sum of its proper divisors (695708980).

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

631982420 is a wasteful number, since it uses less digits than its factorization.

631982420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12587 (or 12585 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 631982420 is about 25139.2605300952. The cubic root of 631982420 is about 858.1601282666.

The spelling of 631982420 in words is "six hundred thirty-one million, nine hundred eighty-two thousand, four hundred twenty".