27820205890 has 16 divisors (see below), whose sum is σ = 50148852480. Its totient is φ = 11111975280.

The previous prime is 27820205879. The next prime is 27820205921. The reversal of 27820205890 is 9850202872.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2006130 + ... + 2019949.

It is an arithmetic number, because the mean of its divisors is an integer number (3134303280).

Almost surely, 2^27820205890 is an apocalyptic number.

27820205890 is a deficient number, since it is larger than the sum of its proper divisors (22328646590).

27820205890 is a wasteful number, since it uses less digits than its factorization.

27820205890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4026777.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 27820205890 in words is "twenty-seven billion, eight hundred twenty million, two hundred five thousand, eight hundred ninety".