31072140 has 96 divisors (see below), whose sum is σ = 105477120. Its totient is φ = 7531200.

The previous prime is 31072133. The next prime is 31072157. The reversal of 31072140 is 4127013.

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

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, 3325 + ... + 8555.

It is an arithmetic number, because the mean of its divisors is an integer number (1098720).

Almost surely, 2^31072140 is an apocalyptic number.

31072140 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 31072140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52738560).

31072140 is an abundant number, since it is smaller than the sum of its proper divisors (74404980).

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

31072140 is a wasteful number, since it uses less digits than its factorization.

31072140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5260 (or 5252 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 31072140 is about 5574.2389615086. The cubic root of 31072140 is about 314.3815530229.

Adding to 31072140 its reverse (4127013), we get a palindrome (35199153).

The spelling of 31072140 in words is "thirty-one million, seventy-two thousand, one hundred forty".