27780066 has 12 divisors (see below), whose sum is σ = 60190182. Its totient is φ = 9260016.

The previous prime is 27780047. The next prime is 27780073. The reversal of 27780066 is 66008772.

It can be written as a sum of positive squares in only one way, i.e., 24059025 + 3721041 = 4905^2 + 1929^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 27780066.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 771651 + ... + 771686.

Almost surely, 2^27780066 is an apocalyptic number.

27780066 is an abundant number, since it is smaller than the sum of its proper divisors (32410116).

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

27780066 is a wasteful number, since it uses less digits than its factorization.

27780066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543345 (or 1543342 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 27780066 is about 5270.6798422974. The cubic root of 27780066 is about 302.8617478618.

The spelling of 27780066 in words is "twenty-seven million, seven hundred eighty thousand, sixty-six".