27724989 has 16 divisors (see below), whose sum is σ = 37988352. Its totient is φ = 17978688.

The previous prime is 27724969. The next prime is 27724997. The reversal of 27724989 is 98942772.

It is not a de Polignac number, because 27724989 - 2¹¹ = 27722941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27724919) 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, 19507 + ... + 20879.

It is an arithmetic number, because the mean of its divisors is an integer number (2374272).

Almost surely, 2^27724989 is an apocalyptic number.

It is an amenable number.

27724989 is a deficient number, since it is larger than the sum of its proper divisors (10263363).

27724989 is a wasteful number, since it uses less digits than its factorization.

27724989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556.

The product of its digits is 508032, while the sum is 48.

The square root of 27724989 is about 5265.4524022158. The cubic root of 27724989 is about 302.6614633314.

The spelling of 27724989 in words is "twenty-seven million, seven hundred twenty-four thousand, nine hundred eighty-nine".