27978822 has 12 divisors (see below), whose sum is σ = 60620820. Its totient is φ = 9326268.

The previous prime is 27978793. The next prime is 27978827. The reversal of 27978822 is 22887972.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27978827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 777172 + ... + 777207.

It is an arithmetic number, because the mean of its divisors is an integer number (5051735).

Almost surely, 2^27978822 is an apocalyptic number.

27978822 is an abundant number, since it is smaller than the sum of its proper divisors (32641998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27978822 is a wasteful number, since it uses less digits than its factorization.

27978822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554387 (or 1554384 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 27978822 is about 5289.5011106909. The cubic root of 27978822 is about 303.5823196857.

The spelling of 27978822 in words is "twenty-seven million, nine hundred seventy-eight thousand, eight hundred twenty-two".