30956240 has 120 divisors (see below), whose sum is σ = 85876200. Its totient is φ = 10343424.

The previous prime is 30956239. The next prime is 30956279. The reversal of 30956240 is 4265903.

It can be written as a sum of positive squares in 4 ways, for example, as 1449616 + 29506624 = 1204^2 + 5432^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 207686 + ... + 207834.

It is an arithmetic number, because the mean of its divisors is an integer number (715635).

Almost surely, 2^30956240 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 30956240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42938100).

30956240 is an abundant number, since it is smaller than the sum of its proper divisors (54919960).

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

30956240 is a wasteful number, since it uses less digits than its factorization.

30956240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 30956240 is about 5563.8332110156. The cubic root of 30956240 is about 313.9901818505.

The spelling of 30956240 in words is "thirty million, nine hundred fifty-six thousand, two hundred forty".