28288771844 has 12 divisors (see below), whose sum is σ = 49512796368. Its totient is φ = 14142258600.

The previous prime is 28288771843. The next prime is 28288771867. The reversal of 28288771844 is 44817788282.

It is a super-2 number, since 2×28288771844² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28288771843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501722 + ... + 555249.

It is an arithmetic number, because the mean of its divisors is an integer number (4126066364).

Almost surely, 2^28288771844 is an apocalyptic number.

It is an amenable number.

28288771844 is a deficient number, since it is larger than the sum of its proper divisors (21224024524).

28288771844 is a wasteful number, since it uses less digits than its factorization.

28288771844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063666 (or 1063664 counting only the distinct ones).

The product of its digits is 12845056, while the sum is 59.

The spelling of 28288771844 in words is "twenty-eight billion, two hundred eighty-eight million, seven hundred seventy-one thousand, eight hundred forty-four".