27528991 has 4 divisors (see below), whose sum is σ = 31461712. Its totient is φ = 23596272.

The previous prime is 27528983. The next prime is 27529003. The reversal of 27528991 is 19982572.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 27528991 - 2³ = 27528983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27528691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1966350 + ... + 1966363.

It is an arithmetic number, because the mean of its divisors is an integer number (7865428).

Almost surely, 2^27528991 is an apocalyptic number.

27528991 is a deficient number, since it is larger than the sum of its proper divisors (3932721).

27528991 is an equidigital number, since it uses as much as digits as its factorization.

27528991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3932720.

The product of its digits is 90720, while the sum is 43.

The square root of 27528991 is about 5246.8076961139. The cubic root of 27528991 is about 301.9465681825.

The spelling of 27528991 in words is "twenty-seven million, five hundred twenty-eight thousand, nine hundred ninety-one".