27720080 has 20 divisors (see below), whose sum is σ = 64449372. Its totient is φ = 11088000.

The previous prime is 27720053. The next prime is 27720089. The reversal of 27720080 is 8002772.

It can be written as a sum of positive squares in 2 ways, for example, as 16777216 + 10942864 = 4096^2 + 3308^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (27720089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173171 + ... + 173330.

Almost surely, 2^27720080 is an apocalyptic number.

27720080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27720080 is an abundant number, since it is smaller than the sum of its proper divisors (36729292).

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

27720080 is a wasteful number, since it uses less digits than its factorization.

27720080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346514 (or 346508 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 27720080 is about 5264.9862298016. The cubic root of 27720080 is about 302.6435991485.

The spelling of 27720080 in words is "twenty-seven million, seven hundred twenty thousand, eighty".