28213643777 has 8 divisors (see below), whose sum is σ = 31149347040. Its totient is φ = 25339744960.

The previous prime is 28213643747. The next prime is 28213643797. The reversal of 28213643777 is 77734631282.

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 28213643777 - 2¹⁰ = 28213642753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28213643747) 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, 15450152 + ... + 15451977.

It is an arithmetic number, because the mean of its divisors is an integer number (3893668380).

Almost surely, 2^28213643777 is an apocalyptic number.

It is an amenable number.

28213643777 is a deficient number, since it is larger than the sum of its proper divisors (2935703263).

28213643777 is a wasteful number, since it uses less digits than its factorization.

28213643777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30902223.

The product of its digits is 2370816, while the sum is 50.

The spelling of 28213643777 in words is "twenty-eight billion, two hundred thirteen million, six hundred forty-three thousand, seven hundred seventy-seven".