31396109472 has 432 divisors, whose sum is σ = 113994284040. Its totient is φ = 8121544704.

The previous prime is 31396109431. The next prime is 31396109509. The reversal of 31396109472 is 27490169313.

It can be written as a sum of positive squares in 4 ways, for example, as 22080771216 + 9315338256 = 148596^2 + 96516^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 9721554 + ... + 9724782.

Almost surely, 2^31396109472 is an apocalyptic number.

31396109472 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 31396109472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56997142020).

31396109472 is an abundant number, since it is smaller than the sum of its proper divisors (82598174568).

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

31396109472 is a wasteful number, since it uses less digits than its factorization.

31396109472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325 (or 3307 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The spelling of 31396109472 in words is "thirty-one billion, three hundred ninety-six million, one hundred nine thousand, four hundred seventy-two".