28644216723 has 12 divisors (see below), whose sum is σ = 41378898288. Its totient is φ = 19094335920.

The previous prime is 28644216701. The next prime is 28644216739. The reversal of 28644216723 is 32761244682.

It is a happy number.

28644216723 is a `hidden beast` number, since 28 + 6 + 442 + 167 + 23 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-28644216723 is a prime.

It is a super-4 number, since 4×28644216723⁴ (a number of 43 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is not an unprimeable number, because it can be changed into a prime (28644216743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46623 + ... + 243848.

It is an arithmetic number, because the mean of its divisors is an integer number (3448241524).

Almost surely, 2^28644216723 is an apocalyptic number.

28644216723 is a deficient number, since it is larger than the sum of its proper divisors (12734681565).

28644216723 is a wasteful number, since it uses less digits than its factorization.

28644216723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301434 (or 301431 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

The spelling of 28644216723 in words is "twenty-eight billion, six hundred forty-four million, two hundred sixteen thousand, seven hundred twenty-three".