27780872 has 32 divisors (see below), whose sum is σ = 62121600. Its totient is φ = 11387904.

The previous prime is 27780871. The next prime is 27780877. The reversal of 27780872 is 27808772.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (27780871) 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 7 ways as a sum of consecutive naturals, for example, 9497 + ... + 12072.

It is an arithmetic number, because the mean of its divisors is an integer number (1941300).

Almost surely, 2^27780872 is an apocalyptic number.

It is an amenable number.

27780872 is an abundant number, since it is smaller than the sum of its proper divisors (34340728).

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

27780872 is a wasteful number, since it uses less digits than its factorization.

27780872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21605 (or 21601 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 41.

The square root of 27780872 is about 5270.7563024674. The cubic root of 27780872 is about 302.8646768710.

The spelling of 27780872 in words is "twenty-seven million, seven hundred eighty thousand, eight hundred seventy-two".