27705121 has 8 divisors (see below), whose sum is σ = 30346920. Its totient is φ = 25175808.

The previous prime is 27705113. The next prime is 27705149. The reversal of 27705121 is 12150772.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1079521 + 26625600 = 1039^2 + 5160^2 .

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 27705121 - 2³ = 27705113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27705101) 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, 27606 + ... + 28591.

It is an arithmetic number, because the mean of its divisors is an integer number (3793365).

Almost surely, 2^27705121 is an apocalyptic number.

It is an amenable number.

27705121 is a deficient number, since it is larger than the sum of its proper divisors (2641799).

27705121 is a wasteful number, since it uses less digits than its factorization.

27705121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56243.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 27705121 is about 5263.5654265906. The cubic root of 27705121 is about 302.5891493271.

Adding to 27705121 its reverse (12150772), we get a palindrome (39855893).

The spelling of 27705121 in words is "twenty-seven million, seven hundred five thousand, one hundred twenty-one".