28081660655 has 8 divisors (see below), whose sum is σ = 33725419200. Its totient is φ = 22447044256.

The previous prime is 28081660583. The next prime is 28081660657. The reversal of 28081660655 is 55606618082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28081660655 - 2¹⁶ = 28081595119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081660657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2278775 + ... + 2291064.

It is an arithmetic number, because the mean of its divisors is an integer number (4215677400).

Almost surely, 2^28081660655 is an apocalyptic number.

28081660655 is a deficient number, since it is larger than the sum of its proper divisors (5643758545).

28081660655 is a wasteful number, since it uses less digits than its factorization.

28081660655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4571073.

The product of its (nonzero) digits is 691200, while the sum is 47.

The spelling of 28081660655 in words is "twenty-eight billion, eighty-one million, six hundred sixty thousand, six hundred fifty-five".