30870891 has 12 divisors (see below), whose sum is σ = 45009432. Its totient is φ = 20387616.

The previous prime is 30870887. The next prime is 30870901. The reversal of 30870891 is 19807803.

It is not a de Polignac number, because 30870891 - 2² = 30870887 is a prime.

It is a super-2 number, since 2×30870891² = 1906023822267762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30870811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15066 + ... + 16991.

It is an arithmetic number, because the mean of its divisors is an integer number (3750786).

Almost surely, 2^30870891 is an apocalyptic number.

30870891 is a deficient number, since it is larger than the sum of its proper divisors (14138541).

30870891 is a wasteful number, since it uses less digits than its factorization.

30870891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32170 (or 32167 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 30870891 is about 5556.1579351203. The cubic root of 30870891 is about 313.7013503189.

The spelling of 30870891 in words is "thirty million, eight hundred seventy thousand, eight hundred ninety-one".