30878720 has 88 divisors (see below), whose sum is σ = 76541424. Its totient is φ = 11943936.

The previous prime is 30878713. The next prime is 30878737. The reversal of 30878720 is 2787803.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189359 + ... + 189521.

Almost surely, 2^30878720 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 30878720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38270712).

30878720 is an abundant number, since it is smaller than the sum of its proper divisors (45662704).

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

30878720 is a wasteful number, since it uses less digits than its factorization.

30878720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 30878720 is about 5556.8624240663. The cubic root of 30878720 is about 313.7278667794.

The spelling of 30878720 in words is "thirty million, eight hundred seventy-eight thousand, seven hundred twenty".