31987682 has 4 divisors (see below), whose sum is σ = 47981526. Its totient is φ = 15993840.

The previous prime is 31987663. The next prime is 31987699. The reversal of 31987682 is 28678913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28678913 = 131 ⋅218923.

It can be written as a sum of positive squares in only one way, i.e., 30924721 + 1062961 = 5561^2 + 1031^2 .

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 as a sum of consecutive naturals, namely, 7996919 + ... + 7996922.

Almost surely, 2^31987682 is an apocalyptic number.

31987682 is a deficient number, since it is larger than the sum of its proper divisors (15993844).

31987682 is a wasteful number, since it uses less digits than its factorization.

31987682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15993843.

The product of its digits is 145152, while the sum is 44.

The square root of 31987682 is about 5655.7653770290. The cubic root of 31987682 is about 317.4394684860.

The spelling of 31987682 in words is "thirty-one million, nine hundred eighty-seven thousand, six hundred eighty-two".