31088040 has 128 divisors (see below), whose sum is σ = 98565120. Its totient is φ = 7833600.

The previous prime is 31088039. The next prime is 31088081. The reversal of 31088040 is 4088013.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 31088040.

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, 226852 + ... + 226988.

It is an arithmetic number, because the mean of its divisors is an integer number (770040).

Almost surely, 2^31088040 is an apocalyptic number.

31088040 is a gapful number since it is divisible by the number (30) 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 31088040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49282560).

31088040 is an abundant number, since it is smaller than the sum of its proper divisors (67477080).

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

31088040 is a wasteful number, since it uses less digits than its factorization.

31088040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 31088040 is about 5575.6649827621. The cubic root of 31088040 is about 314.4351681940.

The spelling of 31088040 in words is "thirty-one million, eighty-eight thousand, forty".