31700080 has 40 divisors (see below), whose sum is σ = 74754144. Its totient is φ = 12499200.

The previous prime is 31700063. The next prime is 31700111. The reversal of 31700080 is 8000713.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2890 + ... + 8470.

Almost surely, 2^31700080 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 31700080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37377072).

31700080 is an abundant number, since it is smaller than the sum of its proper divisors (43054064).

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

31700080 is a wasteful number, since it uses less digits than its factorization.

31700080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5665 (or 5659 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 31700080 is about 5630.2824085475. The cubic root of 31700080 is about 316.4852343272.

Adding to 31700080 its reverse (8000713), we get a palindrome (39700793).

The spelling of 31700080 in words is "thirty-one million, seven hundred thousand, eighty".