28768657838 has 4 divisors (see below), whose sum is σ = 43152986760. Its totient is φ = 14384328918.

The previous prime is 28768657823. The next prime is 28768657843. The reversal of 28768657838 is 83875686782.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7192164458 + ... + 7192164461.

It is an arithmetic number, because the mean of its divisors is an integer number (10788246690).

Almost surely, 2^28768657838 is an apocalyptic number.

28768657838 is a deficient number, since it is larger than the sum of its proper divisors (14384328922).

28768657838 is a wasteful number, since it uses less digits than its factorization.

28768657838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14384328921.

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

The spelling of 28768657838 in words is "twenty-eight billion, seven hundred sixty-eight million, six hundred fifty-seven thousand, eight hundred thirty-eight".