30886720 has 56 divisors (see below), whose sum is σ = 74029824. Its totient is φ = 12274176.

The previous prime is 30886717. The next prime is 30886721. The reversal of 30886720 is 2768803.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30886721) 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, 83977 + ... + 84343.

Almost surely, 2^30886720 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 30886720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37014912).

30886720 is an abundant number, since it is smaller than the sum of its proper divisors (43143104).

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

30886720 is a wasteful number, since it uses less digits than its factorization.

30886720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 30886720 is about 5557.5822081189. The cubic root of 30886720 is about 313.7549577795.

The spelling of 30886720 in words is "thirty million, eight hundred eighty-six thousand, seven hundred twenty".