27721369 has 16 divisors (see below), whose sum is σ = 30913344. Its totient is φ = 24696000.

The previous prime is 27721367. The next prime is 27721387. The reversal of 27721369 is 96312772.

It is a cyclic number.

It is not a de Polignac number, because 27721369 - 2¹ = 27721367 is a prime.

It is a super-2 number, since 2×27721369² = 1536948598468322, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (31752) is a multiple of the sum of its prime divisors (648).

It is not an unprimeable number, because it can be changed into a prime (27721363) 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, 56214 + ... + 56704.

It is an arithmetic number, because the mean of its divisors is an integer number (1932084).

Almost surely, 2^27721369 is an apocalyptic number.

It is an amenable number.

27721369 is a deficient number, since it is larger than the sum of its proper divisors (3191975).

27721369 is a wasteful number, since it uses less digits than its factorization.

27721369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648.

The product of its digits is 31752, while the sum is 37.

The square root of 27721369 is about 5265.1086408544. The cubic root of 27721369 is about 302.6482901108.

The spelling of 27721369 in words is "twenty-seven million, seven hundred twenty-one thousand, three hundred sixty-nine".