27820345 has 16 divisors (see below), whose sum is σ = 39086208. Its totient is φ = 18610560.

The previous prime is 27820333. The next prime is 27820357. The reversal of 27820345 is 54302872.

It is an interprime number because it is at equal distance from previous prime (27820333) and next prime (27820357).

It is not a de Polignac number, because 27820345 - 2⁷ = 27820217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8259 + ... + 11128.

It is an arithmetic number, because the mean of its divisors is an integer number (2442888).

Almost surely, 2^27820345 is an apocalyptic number.

It is an amenable number.

27820345 is a deficient number, since it is larger than the sum of its proper divisors (11265863).

27820345 is a wasteful number, since it uses less digits than its factorization.

27820345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19440.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 27820345 is about 5274.4995023225. The cubic root of 27820345 is about 303.0080527365.

The spelling of 27820345 in words is "twenty-seven million, eight hundred twenty thousand, three hundred forty-five".