31880638 has 4 divisors (see below), whose sum is σ = 47820960. Its totient is φ = 15940318.

The previous prime is 31880621. The next prime is 31880659. The reversal of 31880638 is 83608813.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 31880597 and 31880606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7970158 + ... + 7970161.

It is an arithmetic number, because the mean of its divisors is an integer number (11955240).

Almost surely, 2^31880638 is an apocalyptic number.

31880638 is a deficient number, since it is larger than the sum of its proper divisors (15940322).

31880638 is a wasteful number, since it uses less digits than its factorization.

31880638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15940321.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 31880638 is about 5646.2941829132. The cubic root of 31880638 is about 317.0849782296.

The spelling of 31880638 in words is "thirty-one million, eight hundred eighty thousand, six hundred thirty-eight".