27879969 has 16 divisors (see below), whose sum is σ = 40544000. Its totient is φ = 16937856.

The previous prime is 27879947. The next prime is 27879997. The reversal of 27879969 is 96997872.

27879969 = 222² + 223² + ... + 455².

It is not a de Polignac number, because 27879969 - 2¹⁵ = 27847201 is a prime.

It is a super-2 number, since 2×27879969² = 1554585342881922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27879769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1444 + ... + 7605.

It is an arithmetic number, because the mean of its divisors is an integer number (2534000).

Almost surely, 2^27879969 is an apocalyptic number.

It is an amenable number.

27879969 is a deficient number, since it is larger than the sum of its proper divisors (12664031).

27879969 is a wasteful number, since it uses less digits than its factorization.

27879969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9144.

The product of its digits is 3429216, while the sum is 57.

The square root of 27879969 is about 5280.1485774550. The cubic root of 27879969 is about 303.2243651853.

The spelling of 27879969 in words is "twenty-seven million, eight hundred seventy-nine thousand, nine hundred sixty-nine".