28420942657 has 8 divisors (see below), whose sum is σ = 30074336640. Its totient is φ = 26802357120.

The previous prime is 28420942639. The next prime is 28420942661. The reversal of 28420942657 is 75624902482.

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 28420942657 - 2¹¹ = 28420940609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28420942657.

It is not an unprimeable number, because it can be changed into a prime (28420942157) 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, 8700432 + ... + 8703697.

It is an arithmetic number, because the mean of its divisors is an integer number (3759292080).

Almost surely, 2^28420942657 is an apocalyptic number.

It is an amenable number.

28420942657 is a deficient number, since it is larger than the sum of its proper divisors (1653393983).

28420942657 is a wasteful number, since it uses less digits than its factorization.

28420942657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17404223.

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 28420942657 in words is "twenty-eight billion, four hundred twenty million, nine hundred forty-two thousand, six hundred fifty-seven".