30890645 has 4 divisors (see below), whose sum is σ = 37068780. Its totient is φ = 24712512.

The previous prime is 30890603. The next prime is 30890681. The reversal of 30890645 is 54609803.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14577124 + 16313521 = 3818^2 + 4039^2 .

It is a cyclic number.

It is not a de Polignac number, because 30890645 - 2⁸ = 30890389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3089060 + ... + 3089069.

It is an arithmetic number, because the mean of its divisors is an integer number (9267195).

Almost surely, 2^30890645 is an apocalyptic number.

It is an amenable number.

30890645 is a deficient number, since it is larger than the sum of its proper divisors (6178135).

30890645 is an equidigital number, since it uses as much as digits as its factorization.

30890645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6178134.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 30890645 is about 5557.9353180835. The cubic root of 30890645 is about 313.7682475908.

The spelling of 30890645 in words is "thirty million, eight hundred ninety thousand, six hundred forty-five".