28285776664 has 8 divisors (see below), whose sum is σ = 53035831260. Its totient is φ = 14142888328.

The previous prime is 28285776599. The next prime is 28285776683. The reversal of 28285776664 is 46667758282.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×28285776664² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1767861034 + ... + 1767861049.

Almost surely, 2^28285776664 is an apocalyptic number.

It is an amenable number.

28285776664 is a deficient number, since it is larger than the sum of its proper divisors (24750054596).

28285776664 is a wasteful number, since it uses less digits than its factorization.

28285776664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3535722089 (or 3535722085 counting only the distinct ones).

The product of its digits is 54190080, while the sum is 61.

The spelling of 28285776664 in words is "twenty-eight billion, two hundred eighty-five million, seven hundred seventy-six thousand, six hundred sixty-four".