31230072 has 96 divisors (see below), whose sum is σ = 91587600. Its totient is φ = 9580032.

The previous prime is 31230061. The next prime is 31230077. The reversal of 31230072 is 27003213.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230077) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50308 + ... + 50924.

Almost surely, 2^31230072 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 31230072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45793800).

31230072 is an abundant number, since it is smaller than the sum of its proper divisors (60357528).

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

31230072 is a wasteful number, since it uses less digits than its factorization.

31230072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 31230072 is about 5588.3872449930. The cubic root of 31230072 is about 314.9132943521.

Adding to 31230072 its reverse (27003213), we get a palindrome (58233285).

The spelling of 31230072 in words is "thirty-one million, two hundred thirty thousand, seventy-two".