27819980 has 24 divisors (see below), whose sum is σ = 58650480. Its totient is φ = 11084480.

The previous prime is 27819977. The next prime is 27819983. The reversal of 27819980 is 8991872.

It is an interprime number because it is at equal distance from previous prime (27819977) and next prime (27819983).

It is not an unprimeable number, because it can be changed into a prime (27819983) 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, 2795 + ... + 7965.

It is an arithmetic number, because the mean of its divisors is an integer number (2443770).

Almost surely, 2^27819980 is an apocalyptic number.

27819980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27819980 is an abundant number, since it is smaller than the sum of its proper divisors (30830500).

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

27819980 is a wasteful number, since it uses less digits than its factorization.

27819980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5449 (or 5447 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 27819980 is about 5274.4649017697. The cubic root of 27819980 is about 303.0067275861.

The spelling of 27819980 in words is "twenty-seven million, eight hundred nineteen thousand, nine hundred eighty".