31287663080 has 16 divisors (see below), whose sum is σ = 70397242020. Its totient is φ = 12515065216.

The previous prime is 31287663059. The next prime is 31287663083. The reversal of 31287663080 is 8036678213.

It can be written as a sum of positive squares in 2 ways, for example, as 29369047876 + 1918615204 = 171374^2 + 43802^2 .

It is a super-2 number, since 2×31287663080² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31287663083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391095749 + ... + 391095828.

Almost surely, 2^31287663080 is an apocalyptic number.

It is an amenable number.

31287663080 is an abundant number, since it is smaller than the sum of its proper divisors (39109578940).

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

31287663080 is a wasteful number, since it uses less digits than its factorization.

31287663080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782191588 (or 782191584 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 31287663080 in words is "thirty-one billion, two hundred eighty-seven million, six hundred sixty-three thousand, eighty".