28764138578 has 16 divisors (see below), whose sum is σ = 50900596224. Its totient is φ = 11929826880.

The previous prime is 28764138541. The next prime is 28764138647. The reversal of 28764138578 is 87583146782.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33137975 + ... + 33138842.

It is an arithmetic number, because the mean of its divisors is an integer number (3181287264).

Almost surely, 2^28764138578 is an apocalyptic number.

28764138578 is a deficient number, since it is larger than the sum of its proper divisors (22136457646).

28764138578 is a wasteful number, since it uses less digits than its factorization.

28764138578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66276857.

The product of its digits is 18063360, while the sum is 59.

The spelling of 28764138578 in words is "twenty-eight billion, seven hundred sixty-four million, one hundred thirty-eight thousand, five hundred seventy-eight".