31140202340 has 24 divisors (see below), whose sum is σ = 70424765880. Its totient is φ = 11497920768.

The previous prime is 31140202337. The next prime is 31140202391. The reversal of 31140202340 is 4320204113.

It can be written as a sum of positive squares in 4 ways, for example, as 9834496 + 31130367844 = 3136^2 + 176438^2 .

It is a super-2 number, since 2×31140202340² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59884745 + ... + 59885264.

It is an arithmetic number, because the mean of its divisors is an integer number (2934365245).

Almost surely, 2^31140202340 is an apocalyptic number.

It is an amenable number.

31140202340 is an abundant number, since it is smaller than the sum of its proper divisors (39284563540).

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

31140202340 is a wasteful number, since it uses less digits than its factorization.

31140202340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119770031 (or 119770029 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31140202340 its reverse (4320204113), we get a palindrome (35460406453).

The spelling of 31140202340 in words is "thirty-one billion, one hundred forty million, two hundred two thousand, three hundred forty".