31134720 has 88 divisors (see below), whose sum is σ = 99631584. Its totient is φ = 8298496.

The previous prime is 31134679. The next prime is 31134721. The reversal of 31134720 is 2743113.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31134721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14347 + ... + 16373.

Almost surely, 2^31134720 is an apocalyptic number.

31134720 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 31134720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49815792).

31134720 is an abundant number, since it is smaller than the sum of its proper divisors (68496864).

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

31134720 is a wasteful number, since it uses less digits than its factorization.

31134720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055 (or 2037 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 31134720 is about 5579.8494603349. The cubic root of 31134720 is about 314.5924687005.

Adding to 31134720 its reverse (2743113), we get a palindrome (33877833).

The spelling of 31134720 in words is "thirty-one million, one hundred thirty-four thousand, seven hundred twenty".