28138766512 has 20 divisors (see below), whose sum is σ = 54561592656. Its totient is φ = 14058355520.

The previous prime is 28138766477. The next prime is 28138766531. The reversal of 28138766512 is 21566783182.

It is a happy number.

It is a super-2 number, since 2×28138766512² (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 3 ways as a sum of consecutive naturals, for example, 668164 + ... + 709027.

Almost surely, 2^28138766512 is an apocalyptic number.

It is an amenable number.

28138766512 is a deficient number, since it is larger than the sum of its proper divisors (26422826144).

28138766512 is a wasteful number, since it uses less digits than its factorization.

28138766512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378476 (or 1378470 counting only the distinct ones).

The product of its digits is 967680, while the sum is 49.

The spelling of 28138766512 in words is "twenty-eight billion, one hundred thirty-eight million, seven hundred sixty-six thousand, five hundred twelve".