31380700 has 72 divisors (see below), whose sum is σ = 74370240. Its totient is φ = 11424000.

The previous prime is 31380683. The next prime is 31380709. The reversal of 31380700 is 708313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31380709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131181 + ... + 131419.

It is an arithmetic number, because the mean of its divisors is an integer number (1032920).

Almost surely, 2^31380700 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31380700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37185120).

31380700 is an abundant number, since it is smaller than the sum of its proper divisors (42989540).

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

31380700 is a wasteful number, since it uses less digits than its factorization.

31380700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 31380700 is about 5601.8479093956. The cubic root of 31380700 is about 315.4187761774.

The spelling of 31380700 in words is "thirty-one million, three hundred eighty thousand, seven hundred".