31428572736 has 56 divisors (see below), whose sum is σ = 90714295584. Its totient is φ = 9523809280.

The previous prime is 31428572731. The next prime is 31428572743. The reversal of 31428572736 is 63727582413.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (31428572731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7438365 + ... + 7442588.

Almost surely, 2^31428572736 is an apocalyptic number.

It is an amenable number.

31428572736 is an abundant number, since it is smaller than the sum of its proper divisors (59285722848).

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

31428572736 is a wasteful number, since it uses less digits than its factorization.

31428572736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14880979 (or 14880969 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 48.

The spelling of 31428572736 in words is "thirty-one billion, four hundred twenty-eight million, five hundred seventy-two thousand, seven hundred thirty-six".