31723142320 has 40 divisors (see below), whose sum is σ = 73876740336. Its totient is φ = 12668537088.

The previous prime is 31723142299. The next prime is 31723142323. The reversal of 31723142320 is 2324132713.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (31723142323) 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, 274402 + ... + 372481.

Almost surely, 2^31723142320 is an apocalyptic number.

It is an amenable number.

31723142320 is an abundant number, since it is smaller than the sum of its proper divisors (42153598016).

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

31723142320 is a wasteful number, since it uses less digits than its factorization.

31723142320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647509 (or 647503 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The spelling of 31723142320 in words is "thirty-one billion, seven hundred twenty-three million, one hundred forty-two thousand, three hundred twenty".