27777655680 has 128 divisors (see below), whose sum is σ = 92391045120. Its totient is φ = 7085303808.

The previous prime is 27777655667. The next prime is 27777655729. The reversal of 27777655680 is 8655677772.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270352 + ... + 358671.

It is an arithmetic number, because the mean of its divisors is an integer number (721805040).

Almost surely, 2^27777655680 is an apocalyptic number.

27777655680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27777655680 is an abundant number, since it is smaller than the sum of its proper divisors (64613389440).

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

27777655680 is a wasteful number, since it uses less digits than its factorization.

27777655680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629068 (or 629056 counting only the distinct ones).

The product of its (nonzero) digits is 34574400, while the sum is 60.

The spelling of 27777655680 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred fifty-five thousand, six hundred eighty".