31704372 has 90 divisors (see below), whose sum is σ = 96461442. Its totient is φ = 9053856.

The previous prime is 31704347. The next prime is 31704377. The reversal of 31704372 is 27340713.

It can be written as a sum of positive squares in only one way, i.e., 18352656 + 13351716 = 4284^2 + 3654^2 .

It is a super-4 number, since 4×31704372⁴ (a number of 31 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31704377) by changing a digit.

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 29 ways as a sum of consecutive naturals, for example, 14878 + ... + 16874.

Almost surely, 2^31704372 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 31704372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48230721).

31704372 is an abundant number, since it is smaller than the sum of its proper divisors (64757070).

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

31704372 is a wasteful number, since it uses less digits than its factorization.

31704372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027 (or 2009 counting only the distinct ones).

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

The square root of 31704372 is about 5630.6635488191. The cubic root of 31704372 is about 316.4995170811.

The spelling of 31704372 in words is "thirty-one million, seven hundred four thousand, three hundred seventy-two".