31157088 has 96 divisors (see below), whose sum is σ = 86800896. Its totient is φ = 9765888.

The previous prime is 31157083. The next prime is 31157101. The reversal of 31157088 is 88075113.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31157081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227356 + ... + 227492.

It is an arithmetic number, because the mean of its divisors is an integer number (904176).

Almost surely, 2^31157088 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 31157088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43400448).

31157088 is an abundant number, since it is smaller than the sum of its proper divisors (55643808).

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

31157088 is a wasteful number, since it uses less digits than its factorization.

31157088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 31157088 is about 5581.8534556185. The cubic root of 31157088 is about 314.6677878284.

The spelling of 31157088 in words is "thirty-one million, one hundred fifty-seven thousand, eighty-eight".