27900945 has 24 divisors (see below), whose sum is σ = 48484800. Its totient is φ = 14842656.

The previous prime is 27900889. The next prime is 27900953. The reversal of 27900945 is 54900972.

It is not a de Polignac number, because 27900945 - 2¹⁴ = 27884561 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32836 + ... + 33674.

It is an arithmetic number, because the mean of its divisors is an integer number (2020200).

Almost surely, 2^27900945 is an apocalyptic number.

It is an amenable number.

27900945 is a deficient number, since it is larger than the sum of its proper divisors (20583855).

27900945 is a wasteful number, since it uses less digits than its factorization.

27900945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589 (or 1586 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 27900945 is about 5282.1345117291. The cubic root of 27900945 is about 303.3003915709.

The spelling of 27900945 in words is "twenty-seven million, nine hundred thousand, nine hundred forty-five".