27749945 has 8 divisors (see below), whose sum is σ = 33439560. Its totient is φ = 22106880.

The previous prime is 27749893. The next prime is 27749947. The reversal of 27749945 is 54994772.

It can be written as a sum of positive squares in 4 ways, for example, as 11363641 + 16386304 = 3371^2 + 4048^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-27749945 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 27749945.

It is not an unprimeable number, because it can be changed into a prime (27749947) 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, 10310 + ... + 12719.

It is an arithmetic number, because the mean of its divisors is an integer number (4179945).

Almost surely, 2^27749945 is an apocalyptic number.

It is an amenable number.

27749945 is a deficient number, since it is larger than the sum of its proper divisors (5689615).

27749945 is a wasteful number, since it uses less digits than its factorization.

27749945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23275.

The product of its digits is 635040, while the sum is 47.

The square root of 27749945 is about 5267.8216560548. The cubic root of 27749945 is about 302.7522473088.

The spelling of 27749945 in words is "twenty-seven million, seven hundred forty-nine thousand, nine hundred forty-five".