27161220 has 24 divisors (see below), whose sum is σ = 76051584. Its totient is φ = 7242976.

The previous prime is 27161213. The next prime is 27161237. The reversal of 27161220 is 2216172.

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, 226284 + ... + 226403.

It is an arithmetic number, because the mean of its divisors is an integer number (3168816).

Almost surely, 2^27161220 is an apocalyptic number.

27161220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27161220 is an abundant number, since it is smaller than the sum of its proper divisors (48890364).

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

27161220 is a wasteful number, since it uses less digits than its factorization.

27161220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452699 (or 452697 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 27161220 is about 5211.6427352611. The cubic root of 27161220 is about 300.5959265657.

Adding to 27161220 its reverse (2216172), we get a palindrome (29377392).

The spelling of 27161220 in words is "twenty-seven million, one hundred sixty-one thousand, two hundred twenty".