27720775 has 12 divisors (see below), whose sum is σ = 34506472. Its totient is φ = 22091040.

The previous prime is 27720769. The next prime is 27720787. The reversal of 27720775 is 57702772.

It is not a de Polignac number, because 27720775 - 2⁹ = 27720263 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 11 ways as a sum of consecutive naturals, for example, 4924 + ... + 8926.

Almost surely, 2^27720775 is an apocalyptic number.

27720775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

27720775 is a deficient number, since it is larger than the sum of its proper divisors (6785697).

27720775 is a wasteful number, since it uses less digits than its factorization.

27720775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290 (or 4285 counting only the distinct ones).

The product of its (nonzero) digits is 48020, while the sum is 37.

The square root of 27720775 is about 5265.0522314598. The cubic root of 27720775 is about 302.6461284286.

The spelling of 27720775 in words is "twenty-seven million, seven hundred twenty thousand, seven hundred seventy-five".