31899938633472 has 288 divisors, whose sum is σ = 105096791858688. Its totient is φ = 8364536414208.

The previous prime is 31899938633449. The next prime is 31899938633491. The reversal of 31899938633472 is 27433683999813.

It is a junction number, because it is equal to n+sod(n) for n = 31899938633394 and 31899938633403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10771423 + ... + 13409825.

It is an arithmetic number, because the mean of its divisors is an integer number (364919416176).

Almost surely, 2^{31899938633472} is an apocalyptic number.

31899938633472 is a gapful number since it is divisible by the number (32) 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 31899938633472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52548395929344).

31899938633472 is an abundant number, since it is smaller than the sum of its proper divisors (73196853225216).

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

31899938633472 is a wasteful number, since it uses less digits than its factorization.

31899938633472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638615 (or 2638601 counting only the distinct ones).

The product of its digits is 1269789696, while the sum is 75.

The spelling of 31899938633472 in words is "thirty-one trillion, eight hundred ninety-nine billion, nine hundred thirty-eight million, six hundred thirty-three thousand, four hundred seventy-two".