27978069 has 24 divisors (see below), whose sum is σ = 44897760. Its totient is φ = 15433824.

The previous prime is 27978043. The next prime is 27978091. The reversal of 27978069 is 96087972.

It is not a de Polignac number, because 27978069 - 2⁸ = 27977813 is a prime.

It is a super-2 number, since 2×27978069² = 1565544689937522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27978029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 982 + ... + 7544.

It is an arithmetic number, because the mean of its divisors is an integer number (1870740).

Almost surely, 2^27978069 is an apocalyptic number.

27978069 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

27978069 is a deficient number, since it is larger than the sum of its proper divisors (16919691).

27978069 is a wasteful number, since it uses less digits than its factorization.

27978069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6609 (or 6602 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 27978069 is about 5289.4299314765. The cubic root of 27978069 is about 303.5795962027.

The spelling of 27978069 in words is "twenty-seven million, nine hundred seventy-eight thousand, sixty-nine".