31713870 has 16 divisors (see below), whose sum is σ = 76113360. Its totient is φ = 8457024.

The previous prime is 31713827. The next prime is 31713881. The reversal of 31713870 is 7831713.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1057129 = 31713870 / (3 + 1 + 7 + 1 + 3 + 8 + 7 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528535 + ... + 528594.

It is an arithmetic number, because the mean of its divisors is an integer number (4757085).

Almost surely, 2^31713870 is an apocalyptic number.

31713870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31713870 is an abundant number, since it is smaller than the sum of its proper divisors (44399490).

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

31713870 is a wasteful number, since it uses less digits than its factorization.

31713870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057139.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 31713870 is about 5631.5069031299. The cubic root of 31713870 is about 316.5311195813.

The spelling of 31713870 in words is "thirty-one million, seven hundred thirteen thousand, eight hundred seventy".