27920778 has 16 divisors (see below), whose sum is σ = 56155680. Its totient is φ = 9254576.

The previous prime is 27920719. The next prime is 27920779. The reversal of 27920778 is 87702972.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27920779) 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, 11925 + ... + 14072.

It is an arithmetic number, because the mean of its divisors is an integer number (3509730).

Almost surely, 2^27920778 is an apocalyptic number.

27920778 is an abundant number, since it is smaller than the sum of its proper divisors (28234902).

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

27920778 is a wasteful number, since it uses less digits than its factorization.

27920778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26181.

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 27920778 is about 5284.0115442720. The cubic root of 27920778 is about 303.3722401757.

The spelling of 27920778 in words is "twenty-seven million, nine hundred twenty thousand, seven hundred seventy-eight".