27428581 has 16 divisors (see below), whose sum is σ = 29723904. Its totient is φ = 25242624.

The previous prime is 27428579. The next prime is 27428617. The reversal of 27428581 is 18582472.

It is a cyclic number.

It is not a de Polignac number, because 27428581 - 2¹ = 27428579 is a prime.

It is a super-2 number, since 2×27428581² = 1504654111347122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27428581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27428501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142021 + ... + 142213.

It is an arithmetic number, because the mean of its divisors is an integer number (1857744).

Almost surely, 2^27428581 is an apocalyptic number.

It is an amenable number.

27428581 is a deficient number, since it is larger than the sum of its proper divisors (2295323).

27428581 is a wasteful number, since it uses less digits than its factorization.

27428581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420.

The product of its digits is 35840, while the sum is 37.

The square root of 27428581 is about 5237.2302794512. The cubic root of 27428581 is about 301.5790115312.

The spelling of 27428581 in words is "twenty-seven million, four hundred twenty-eight thousand, five hundred eighty-one".