27992222645 has 4 divisors (see below), whose sum is σ = 33590667180. Its totient is φ = 22393778112.

The previous prime is 27992222623. The next prime is 27992222681. The reversal of 27992222645 is 54622229972.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19064429476 + 8927793169 = 138074^2 + 94487^2 .

It is a cyclic number.

It is not a de Polignac number, because 27992222645 - 2¹² = 27992218549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27992222593 and 27992222602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2799222260 + ... + 2799222269.

It is an arithmetic number, because the mean of its divisors is an integer number (8397666795).

Almost surely, 2^27992222645 is an apocalyptic number.

It is an amenable number.

27992222645 is a deficient number, since it is larger than the sum of its proper divisors (5598444535).

27992222645 is an equidigital number, since it uses as much as digits as its factorization.

27992222645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5598444534.

The product of its digits is 2177280, while the sum is 50.

The spelling of 27992222645 in words is "twenty-seven billion, nine hundred ninety-two million, two hundred twenty-two thousand, six hundred forty-five".