31430772 has 72 divisors (see below), whose sum is σ = 82127136. Its totient is φ = 10131264.

The previous prime is 31430761. The next prime is 31430821. The reversal of 31430772 is 27703413.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 200118 + ... + 200274.

Almost surely, 2^31430772 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 31430772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41063568).

31430772 is an abundant number, since it is smaller than the sum of its proper divisors (50696364).

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

31430772 is a wasteful number, since it uses less digits than its factorization.

31430772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 31430772 is about 5606.3153675119. The cubic root of 31430772 is about 315.5864509597.

The spelling of 31430772 in words is "thirty-one million, four hundred thirty thousand, seven hundred seventy-two".