31725534720 has 320 divisors, whose sum is σ = 111551717376. Its totient is φ = 7627898880.

The previous prime is 31725534661. The next prime is 31725534727. The reversal of 31725534720 is 2743552713.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31725534727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10727482 + ... + 10730438.

Almost surely, 2^31725534720 is an apocalyptic number.

31725534720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31725534720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55775858688).

31725534720 is an abundant number, since it is smaller than the sum of its proper divisors (79826182656).

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

31725534720 is a wasteful number, since it uses less digits than its factorization.

31725534720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121 (or 3105 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 39.

The spelling of 31725534720 in words is "thirty-one billion, seven hundred twenty-five million, five hundred thirty-four thousand, seven hundred twenty".