31431088 has 40 divisors (see below), whose sum is σ = 66120768. Its totient is φ = 14387712.

The previous prime is 31431031. The next prime is 31431121. The reversal of 31431088 is 88013413.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

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, 27945 + ... + 29047.

Almost surely, 2^31431088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31431088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33060384).

31431088 is an abundant number, since it is smaller than the sum of its proper divisors (34689680).

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

31431088 is a wasteful number, since it uses less digits than its factorization.

31431088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261 (or 1255 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 31431088 is about 5606.3435499441. The cubic root of 31431088 is about 315.5875085749.

The spelling of 31431088 in words is "thirty-one million, four hundred thirty-one thousand, eighty-eight".