28757866838 has 16 divisors (see below), whose sum is σ = 44195354784. Its totient is φ = 14030257920.

The previous prime is 28757866817. The next prime is 28757866847. The reversal of 28757866838 is 83866875782.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1030145 + ... + 1057692.

It is an arithmetic number, because the mean of its divisors is an integer number (2762209674).

Almost surely, 2^28757866838 is an apocalyptic number.

28757866838 is a deficient number, since it is larger than the sum of its proper divisors (15437487946).

28757866838 is a wasteful number, since it uses less digits than its factorization.

28757866838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088007.

The product of its digits is 216760320, while the sum is 68.

The spelling of 28757866838 in words is "twenty-eight billion, seven hundred fifty-seven million, eight hundred sixty-six thousand, eight hundred thirty-eight".