28739784657 has 8 divisors (see below), whose sum is σ = 38366277184. Its totient is φ = 19136574288.

The previous prime is 28739784599. The next prime is 28739784677. The reversal of 28739784657 is 75648793782.

It is a happy number.

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

It is not a de Polignac number, because 28739784657 - 2¹¹ = 28739782609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28739784677) by changing a digit.

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, 5817658 + ... + 5822595.

It is an arithmetic number, because the mean of its divisors is an integer number (4795784648).

Almost surely, 2^28739784657 is an apocalyptic number.

It is an amenable number.

28739784657 is a deficient number, since it is larger than the sum of its proper divisors (9626492527).

28739784657 is a wasteful number, since it uses less digits than its factorization.

28739784657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11641079.

The product of its digits is 142248960, while the sum is 66.

The spelling of 28739784657 in words is "twenty-eight billion, seven hundred thirty-nine million, seven hundred eighty-four thousand, six hundred fifty-seven".