27765945 has 48 divisors (see below), whose sum is σ = 50843520. Its totient is φ = 13989888.

The previous prime is 27765929. The next prime is 27765967. The reversal of 27765945 is 54956772.

It is not a de Polignac number, because 27765945 - 2⁴ = 27765929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 27765945.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 143769 + ... + 143961.

It is an arithmetic number, because the mean of its divisors is an integer number (1059240).

Almost surely, 2^27765945 is an apocalyptic number.

It is an amenable number.

27765945 is a deficient number, since it is larger than the sum of its proper divisors (23077575).

27765945 is a wasteful number, since it uses less digits than its factorization.

27765945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366 (or 363 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 27765945 is about 5269.3400915105. The cubic root of 27765945 is about 302.8104228627.

The spelling of 27765945 in words is "twenty-seven million, seven hundred sixty-five thousand, nine hundred forty-five".