28778685737 has 8 divisors (see below), whose sum is σ = 28909900032. Its totient is φ = 28647720000.

The previous prime is 28778685709. The next prime is 28778685743. The reversal of 28778685737 is 73758687782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28778685737 - 2¹⁰ = 28778684713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28778685757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171953 + ... + 295169.

It is an arithmetic number, because the mean of its divisors is an integer number (3613737504).

Almost surely, 2^28778685737 is an apocalyptic number.

It is an amenable number.

28778685737 is a deficient number, since it is larger than the sum of its proper divisors (131214295).

28778685737 is a wasteful number, since it uses less digits than its factorization.

28778685737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124279.

The product of its digits is 221276160, while the sum is 68.

The spelling of 28778685737 in words is "twenty-eight billion, seven hundred seventy-eight million, six hundred eighty-five thousand, seven hundred thirty-seven".