30990825 has 18 divisors (see below), whose sum is σ = 55508414. Its totient is φ = 16528320.

The previous prime is 30990811. The next prime is 30990833. The reversal of 30990825 is 52809903.

It can be written as a sum of positive squares in 3 ways, for example, as 553536 + 30437289 = 744^2 + 5517^2 .

It is not a de Polignac number, because 30990825 - 2⁴ = 30990809 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30990825.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 68644 + ... + 69093.

Almost surely, 2^30990825 is an apocalyptic number.

It is an amenable number.

30990825 is a deficient number, since it is larger than the sum of its proper divisors (24517589).

30990825 is a wasteful number, since it uses less digits than its factorization.

30990825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137753 (or 137745 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 30990825 is about 5566.9403625331. The cubic root of 30990825 is about 314.1070706032.

The spelling of 30990825 in words is "thirty million, nine hundred ninety thousand, eight hundred twenty-five".