31112640 has 224 divisors, whose sum is σ = 118628160. Its totient is φ = 7630848.

The previous prime is 31112617. The next prime is 31112651. The reversal of 31112640 is 4621113.

It is a happy number.

31112640 is a `hidden beast` number, since 3 + 11 + 12 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 112182 + ... + 112458.

It is an arithmetic number, because the mean of its divisors is an integer number (529590).

Almost surely, 2^31112640 is an apocalyptic number.

31112640 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 31112640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59314080).

31112640 is an abundant number, since it is smaller than the sum of its proper divisors (87515520).

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

31112640 is a wasteful number, since it uses less digits than its factorization.

31112640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 300 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 31112640 is about 5577.8705614240. The cubic root of 31112640 is about 314.5180839581.

Adding to 31112640 its reverse (4621113), we get a palindrome (35733753).

The spelling of 31112640 in words is "thirty-one million, one hundred twelve thousand, six hundred forty".