27813969 has 16 divisors (see below), whose sum is σ = 42998400. Its totient is φ = 17736048.

The previous prime is 27813953. The next prime is 27813971. The reversal of 27813969 is 96931872.

It is not a de Polignac number, because 27813969 - 2⁴ = 27813953 is a prime.

It is a super-2 number, since 2×27813969² = 1547233743065922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27813769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21774 + ... + 23015.

It is an arithmetic number, because the mean of its divisors is an integer number (2687400).

Almost surely, 2^27813969 is an apocalyptic number.

It is an amenable number.

27813969 is a deficient number, since it is larger than the sum of its proper divisors (15184431).

27813969 is a wasteful number, since it uses less digits than its factorization.

27813969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44821 (or 44815 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 27813969 is about 5273.8950501503. The cubic root of 27813969 is about 302.9849026886.

It can be divided in two parts, 27813 and 969, that added together give a palindrome (28782).

The spelling of 27813969 in words is "twenty-seven million, eight hundred thirteen thousand, nine hundred sixty-nine".