27628391 has 4 divisors (see below), whose sum is σ = 31575312. Its totient is φ = 23681472.

The previous prime is 27628361. The next prime is 27628399. The reversal of 27628391 is 19382672.

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

It is a cyclic number.

It is not a de Polignac number, because 27628391 - 2⁶ = 27628327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27628399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1973450 + ... + 1973463.

It is an arithmetic number, because the mean of its divisors is an integer number (7893828).

Almost surely, 2^27628391 is an apocalyptic number.

27628391 is a deficient number, since it is larger than the sum of its proper divisors (3946921).

27628391 is an equidigital number, since it uses as much as digits as its factorization.

27628391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3946920.

The product of its digits is 36288, while the sum is 38.

The square root of 27628391 is about 5256.2715873516. The cubic root of 27628391 is about 302.3095484015.

The spelling of 27628391 in words is "twenty-seven million, six hundred twenty-eight thousand, three hundred ninety-one".