30990687 has 24 divisors (see below), whose sum is σ = 51767856. Its totient is φ = 16345728.

The previous prime is 30990679. The next prime is 30990689. The reversal of 30990687 is 78609903.

It is a happy number.

It is not a de Polignac number, because 30990687 - 2³ = 30990679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30990689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6198 + ... + 10019.

It is an arithmetic number, because the mean of its divisors is an integer number (2156994).

Almost surely, 2^30990687 is an apocalyptic number.

30990687 is a deficient number, since it is larger than the sum of its proper divisors (20777169).

30990687 is a wasteful number, since it uses less digits than its factorization.

30990687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16247 (or 16240 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 30990687 is about 5566.9279679191. The cubic root of 30990687 is about 314.1066043701.

The spelling of 30990687 in words is "thirty million, nine hundred ninety thousand, six hundred eighty-seven".