31488565940 has 24 divisors (see below), whose sum is σ = 71212603560. Its totient is φ = 11626547328.

The previous prime is 31488565907. The next prime is 31488565949. The reversal of 31488565940 is 4956588413.

It can be written as a sum of positive squares in 4 ways, for example, as 2065338916 + 29423227024 = 45446^2 + 171532^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31488565949) 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 7 ways as a sum of consecutive naturals, for example, 60554675 + ... + 60555194.

It is an arithmetic number, because the mean of its divisors is an integer number (2967191815).

Almost surely, 2^31488565940 is an apocalyptic number.

It is an amenable number.

31488565940 is an abundant number, since it is smaller than the sum of its proper divisors (39724037620).

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

31488565940 is a wasteful number, since it uses less digits than its factorization.

31488565940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121109891 (or 121109889 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 31488565940 in words is "thirty-one billion, four hundred eighty-eight million, five hundred sixty-five thousand, nine hundred forty".