28138067818 has 24 divisors (see below), whose sum is σ = 50142704832. Its totient is φ = 11802591864.

The previous prime is 28138067809. The next prime is 28138067863. The reversal of 28138067818 is 81876083182.

It is a happy number.

It is a super-2 number, since 2×28138067818² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3049896 + ... + 3059107.

It is an arithmetic number, because the mean of its divisors is an integer number (2089279368).

Almost surely, 2^28138067818 is an apocalyptic number.

28138067818 is a deficient number, since it is larger than the sum of its proper divisors (22004637014).

28138067818 is a wasteful number, since it uses less digits than its factorization.

28138067818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6109066 (or 6109059 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 52.

The spelling of 28138067818 in words is "twenty-eight billion, one hundred thirty-eight million, sixty-seven thousand, eight hundred eighteen".