27806980 has 48 divisors (see below), whose sum is σ = 61190640. Its totient is φ = 10603008.

The previous prime is 27806971. The next prime is 27806981. The reversal of 27806980 is 8960872.

27806980 = 292² + 293² + ... + 476².

It can be written as a sum of positive squares in 8 ways, for example, as 118336 + 27688644 = 344^2 + 5262^2 .

It is not an unprimeable number, because it can be changed into a prime (27806981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38866 + ... + 39574.

It is an arithmetic number, because the mean of its divisors is an integer number (1274805).

Almost surely, 2^27806980 is an apocalyptic number.

27806980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27806980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30595320).

27806980 is an abundant number, since it is smaller than the sum of its proper divisors (33383660).

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

27806980 is a wasteful number, since it uses less digits than its factorization.

27806980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808 (or 806 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 27806980 is about 5273.2324052710. The cubic root of 27806980 is about 302.9595228891.

The spelling of 27806980 in words is "twenty-seven million, eight hundred six thousand, nine hundred eighty".