31505753420 has 48 divisors (see below), whose sum is σ = 67723138560. Its totient is φ = 12305151936.

The previous prime is 31505753371. The next prime is 31505753429. The reversal of 31505753420 is 2435750513.

It is a super-2 number, since 2×31505753420² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31505753429) 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 15 ways as a sum of consecutive naturals, for example, 4935791 + ... + 4942169.

It is an arithmetic number, because the mean of its divisors is an integer number (1410898720).

Almost surely, 2^31505753420 is an apocalyptic number.

It is an amenable number.

31505753420 is an abundant number, since it is smaller than the sum of its proper divisors (36217385140).

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

31505753420 is a wasteful number, since it uses less digits than its factorization.

31505753420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12174 (or 12172 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 35.

The spelling of 31505753420 in words is "thirty-one billion, five hundred five million, seven hundred fifty-three thousand, four hundred twenty".