31433578912 has 48 divisors (see below), whose sum is σ = 64853006400. Its totient is φ = 14968847872.

The previous prime is 31433578903. The next prime is 31433578949. The reversal of 31433578912 is 21987533413.

It is a super-2 number, since 2×31433578912² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

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, 79839 + ... + 263137.

It is an arithmetic number, because the mean of its divisors is an integer number (1351104300).

Almost surely, 2^31433578912 is an apocalyptic number.

31433578912 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 31433578912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32426503200).

31433578912 is an abundant number, since it is smaller than the sum of its proper divisors (33419427488).

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

31433578912 is a wasteful number, since it uses less digits than its factorization.

31433578912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183565 (or 183557 counting only the distinct ones).

The product of its digits is 544320, while the sum is 46.

The spelling of 31433578912 in words is "thirty-one billion, four hundred thirty-three million, five hundred seventy-eight thousand, nine hundred twelve".