27221980 has 12 divisors (see below), whose sum is σ = 57166200. Its totient is φ = 10888784.

The previous prime is 27221969. The next prime is 27221989. The reversal of 27221980 is 8912272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27221989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 680530 + ... + 680569.

It is an arithmetic number, because the mean of its divisors is an integer number (4763850).

Almost surely, 2^27221980 is an apocalyptic number.

27221980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27221980 is an abundant number, since it is smaller than the sum of its proper divisors (29944220).

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

27221980 is a wasteful number, since it uses less digits than its factorization.

27221980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361108 (or 1361106 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 27221980 is about 5217.4687349327. The cubic root of 27221980 is about 300.8199052911.

The spelling of 27221980 in words is "twenty-seven million, two hundred twenty-one thousand, nine hundred eighty".