27940805 has 8 divisors (see below), whose sum is σ = 34161912. Its totient is φ = 21930688.

The previous prime is 27940777. The next prime is 27940853. The reversal of 27940805 is 50804972.

27940805 = 460² + 461² + ... + 565².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 556516 + 27384289 = 746^2 + 5233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27940805 - 2¹⁸ = 27678661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52454 + ... + 52983.

It is an arithmetic number, because the mean of its divisors is an integer number (4270239).

Almost surely, 2^27940805 is an apocalyptic number.

It is an amenable number.

27940805 is a deficient number, since it is larger than the sum of its proper divisors (6221107).

27940805 is a wasteful number, since it uses less digits than its factorization.

27940805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105495.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 27940805 is about 5285.9062609925. The cubic root of 27940805 is about 303.4447570637. Note that the first 3 decimals are identical.

The spelling of 27940805 in words is "twenty-seven million, nine hundred forty thousand, eight hundred five".