27397665 has 24 divisors (see below), whose sum is σ = 48597120. Its totient is φ = 14271264.

The previous prime is 27397633. The next prime is 27397679. The reversal of 27397665 is 56679372.

It is not a de Polignac number, because 27397665 - 2⁵ = 27397633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 27397665.

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, 5145 + ... + 9014.

It is an arithmetic number, because the mean of its divisors is an integer number (2024880).

Almost surely, 2^27397665 is an apocalyptic number.

It is an amenable number.

27397665 is a deficient number, since it is larger than the sum of its proper divisors (21199455).

27397665 is a wasteful number, since it uses less digits than its factorization.

27397665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14213 (or 14210 counting only the distinct ones).

The product of its digits is 476280, while the sum is 45.

The square root of 27397665 is about 5234.2778871588. The cubic root of 27397665 is about 301.4656611305.

It can be divided in two parts, 2739 and 7665, that added together give a square (10404 = 102²).

The spelling of 27397665 in words is "twenty-seven million, three hundred ninety-seven thousand, six hundred sixty-five".