631420640032 has 48 divisors (see below), whose sum is σ = 1529980788672. Its totient is φ = 249792779520.

The previous prime is 631420640029. The next prime is 631420640063. The reversal of 631420640032 is 230046024136.

It is a super-2 number, since 2×631420640032² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 631420639976 and 631420640003.

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, 108414094 + ... + 108419917.

It is an arithmetic number, because the mean of its divisors is an integer number (31874599764).

Almost surely, 2^631420640032 is an apocalyptic number.

It is an amenable number.

631420640032 is an abundant number, since it is smaller than the sum of its proper divisors (898560148640).

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

631420640032 is a wasteful number, since it uses less digits than its factorization.

631420640032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216834041 (or 216834033 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 631420640032 its reverse (230046024136), we get a palindrome (861466664168).

The spelling of 631420640032 in words is "six hundred thirty-one billion, four hundred twenty million, six hundred forty thousand, thirty-two".