31240861648 has 40 divisors (see below), whose sum is σ = 65453346432. Its totient is φ = 14388776448.

The previous prime is 31240861643. The next prime is 31240861649. The reversal of 31240861648 is 84616804213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240861643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1209090 + ... + 1234657.

Almost surely, 2^31240861648 is an apocalyptic number.

It is an amenable number.

31240861648 is an abundant number, since it is smaller than the sum of its proper divisors (34212484784).

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

31240861648 is a wasteful number, since it uses less digits than its factorization.

31240861648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443819 (or 2443813 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 31240861648 in words is "thirty-one billion, two hundred forty million, eight hundred sixty-one thousand, six hundred forty-eight".