30970720 has 48 divisors (see below), whose sum is σ = 79824528. Its totient is φ = 11261440.

The previous prime is 30970691. The next prime is 30970721. The reversal of 30970720 is 2707903.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30970721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7039 + ... + 10558.

It is an arithmetic number, because the mean of its divisors is an integer number (1663011).

Almost surely, 2^30970720 is an apocalyptic number.

30970720 is the 3520-th heptagonal number.

It is an amenable number.

30970720 is an abundant number, since it is smaller than the sum of its proper divisors (48853808).

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

30970720 is a wasteful number, since it uses less digits than its factorization.

30970720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17623 (or 17615 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 28.

The square root of 30970720 is about 5565.1343200322. The cubic root of 30970720 is about 314.0391312612.

The spelling of 30970720 in words is "thirty million, nine hundred seventy thousand, seven hundred twenty".