27550397 has 12 divisors (see below), whose sum is σ = 32195196. Its totient is φ = 23506560.

The previous prime is 27550379. The next prime is 27550447. The reversal of 27550397 is 79305572.

It can be written as a sum of positive squares in 2 ways, for example, as 15202201 + 12348196 = 3899^2 + 3514^2 .

It is not a de Polignac number, because 27550397 - 2⁸ = 27550141 is a prime.

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 27550397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27550357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10643 + ... + 12975.

It is an arithmetic number, because the mean of its divisors is an integer number (2682933).

Almost surely, 2^27550397 is an apocalyptic number.

It is an amenable number.

27550397 is a deficient number, since it is larger than the sum of its proper divisors (4644799).

27550397 is a wasteful number, since it uses less digits than its factorization.

27550397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2588 (or 2581 counting only the distinct ones).

The product of its (nonzero) digits is 66150, while the sum is 38.

The square root of 27550397 is about 5248.8472067684. The cubic root of 27550397 is about 302.0248104699.

The spelling of 27550397 in words is "twenty-seven million, five hundred fifty thousand, three hundred ninety-seven".