27245721 has 8 divisors (see below), whose sum is σ = 36352800. Its totient is φ = 18151232.

The previous prime is 27245707. The next prime is 27245737. The reversal of 27245721 is 12754272.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27245721 - 2¹⁰ = 27244697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27245521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4705 + ... + 8753.

It is an arithmetic number, because the mean of its divisors is an integer number (4544100).

Almost surely, 2^27245721 is an apocalyptic number.

It is an amenable number.

27245721 is a deficient number, since it is larger than the sum of its proper divisors (9107079).

27245721 is a wasteful number, since it uses less digits than its factorization.

27245721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6295.

The product of its digits is 7840, while the sum is 30.

The square root of 27245721 is about 5219.7433844970. The cubic root of 27245721 is about 300.9073308470.

Adding to 27245721 its reverse (12754272), we get a palindrome (39999993).

It can be divided in two parts, 27245 and 721, that added together give a triangular number (27966 = T₂₃₆).

The spelling of 27245721 in words is "twenty-seven million, two hundred forty-five thousand, seven hundred twenty-one".