31160640 has 112 divisors (see below), whose sum is σ = 113092992. Its totient is φ = 7120896.

The previous prime is 31160639. The next prime is 31160651. The reversal of 31160640 is 4606113.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4402 + ... + 9038.

Almost surely, 2^31160640 is an apocalyptic number.

31160640 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 31160640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56546496).

31160640 is an abundant number, since it is smaller than the sum of its proper divisors (81932352).

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

31160640 is a wasteful number, since it uses less digits than its factorization.

31160640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4664 (or 4654 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 31160640 is about 5582.1716204359. The cubic root of 31160640 is about 314.6797450595.

Adding to 31160640 its reverse (4606113), we get a palindrome (35766753).

The spelling of 31160640 in words is "thirty-one million, one hundred sixty thousand, six hundred forty".