27997669 has 6 divisors (see below), whose sum is σ = 32568774. Its totient is φ = 23997960.

The previous prime is 27997663. The next prime is 27997699. The reversal of 27997669 is 96679972.

It can be written as a sum of positive squares in only one way, i.e., 14025025 + 13972644 = 3745^2 + 3738^2 .

It is not a de Polignac number, because 27997669 - 2³ = 27997661 is a prime.

It is a super-2 number, since 2×27997669² = 1567738938867122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27997661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 285642 + ... + 285739.

It is an arithmetic number, because the mean of its divisors is an integer number (5428129).

Almost surely, 2^27997669 is an apocalyptic number.

It is an amenable number.

27997669 is a deficient number, since it is larger than the sum of its proper divisors (4571105).

27997669 is an equidigital number, since it uses as much as digits as its factorization.

27997669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571395 (or 571388 counting only the distinct ones).

The product of its digits is 2571912, while the sum is 55.

The square root of 27997669 is about 5291.2823587482. The cubic root of 27997669 is about 303.6504704193.

The spelling of 27997669 in words is "twenty-seven million, nine hundred ninety-seven thousand, six hundred sixty-nine".