27428561 has 4 divisors (see below), whose sum is σ = 27456000. Its totient is φ = 27401124.

The previous prime is 27428543. The next prime is 27428567. The reversal of 27428561 is 16582472.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27428561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27428567) 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 3 ways as a sum of consecutive naturals, for example, 12161 + ... + 14238.

It is an arithmetic number, because the mean of its divisors is an integer number (6864000).

Almost surely, 2^27428561 is an apocalyptic number.

It is an amenable number.

27428561 is a deficient number, since it is larger than the sum of its proper divisors (27439).

27428561 is a wasteful number, since it uses less digits than its factorization.

27428561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27438.

The product of its digits is 26880, while the sum is 35.

The square root of 27428561 is about 5237.2283700446. The cubic root of 27428561 is about 301.5789382307.

The spelling of 27428561 in words is "twenty-seven million, four hundred twenty-eight thousand, five hundred sixty-one".