27780988672 has 36 divisors (see below), whose sum is σ = 56743095640. Its totient is φ = 13567454208.

The previous prime is 27780988637. The next prime is 27780988693. The reversal of 27780988672 is 27688908772.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1250847 + ... + 1272862.

Almost surely, 2^27780988672 is an apocalyptic number.

It is an amenable number.

27780988672 is an abundant number, since it is smaller than the sum of its proper divisors (28962106968).

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

27780988672 is an equidigital number, since it uses as much as digits as its factorization.

27780988672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523768 (or 2523754 counting only the distinct ones).

The product of its (nonzero) digits is 37933056, while the sum is 64.

The spelling of 27780988672 in words is "twenty-seven billion, seven hundred eighty million, nine hundred eighty-eight thousand, six hundred seventy-two".