31723527640 has 64 divisors (see below), whose sum is σ = 81808776000. Its totient is φ = 10845439488.

The previous prime is 31723527617. The next prime is 31723527677. The reversal of 31723527640 is 4672532713.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 31723527593 and 31723527602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64599 + ... + 260038.

It is an arithmetic number, because the mean of its divisors is an integer number (1278262125).

Almost surely, 2^31723527640 is an apocalyptic number.

It is an amenable number.

31723527640 is an abundant number, since it is smaller than the sum of its proper divisors (50085248360).

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

31723527640 is a wasteful number, since it uses less digits than its factorization.

31723527640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325004 (or 325000 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 40.

The spelling of 31723527640 in words is "thirty-one billion, seven hundred twenty-three million, five hundred twenty-seven thousand, six hundred forty".