31421088 has 96 divisors (see below), whose sum is σ = 93985920. Its totient is φ = 10206720.

The previous prime is 31421081. The next prime is 31421101. The reversal of 31421088 is 88012413.

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

It is a super-2 number, since 2×31421088² = 1974569542207488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31421081) 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, 34981 + ... + 35867.

It is an arithmetic number, because the mean of its divisors is an integer number (979020).

Almost surely, 2^31421088 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 31421088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46992960).

31421088 is an abundant number, since it is smaller than the sum of its proper divisors (62564832).

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

31421088 is a wasteful number, since it uses less digits than its factorization.

31421088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 31421088 is about 5605.4516321167. The cubic root of 31421088 is about 315.5540363024.

The spelling of 31421088 in words is "thirty-one million, four hundred twenty-one thousand, eighty-eight".