31947247208 has 48 divisors (see below), whose sum is σ = 61836970020. Its totient is φ = 15471756288.

The previous prime is 31947247169. The next prime is 31947247223. The reversal of 31947247208 is 80274274913.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27277164964 + 4670082244 = 165158^2 + 68338^2 .

It is a Harshad number since it is a multiple of its sum of digits (47).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1704866 + ... + 1723502.

Almost surely, 2^31947247208 is an apocalyptic number.

It is an amenable number.

31947247208 is a deficient number, since it is larger than the sum of its proper divisors (29889722812).

31947247208 is a wasteful number, since it uses less digits than its factorization.

31947247208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18834 (or 18783 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 31947247208 in words is "thirty-one billion, nine hundred forty-seven million, two hundred forty-seven thousand, two hundred eight".