28417662989 has 4 divisors (see below), whose sum is σ = 28625091324. Its totient is φ = 28210234656.

The previous prime is 28417662979. The next prime is 28417662997. The reversal of 28417662989 is 98926671482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98926671482 = 2 ⋅49463335741.

It can be written as a sum of positive squares in 2 ways, for example, as 8829421225 + 19588241764 = 93965^2 + 139958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28417662989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28417662929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103713962 + ... + 103714235.

It is an arithmetic number, because the mean of its divisors is an integer number (7156272831).

Almost surely, 2^28417662989 is an apocalyptic number.

It is an amenable number.

28417662989 is a deficient number, since it is larger than the sum of its proper divisors (207428335).

28417662989 is a wasteful number, since it uses less digits than its factorization.

28417662989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207428334.

The product of its digits is 20901888, while the sum is 62.

The spelling of 28417662989 in words is "twenty-eight billion, four hundred seventeen million, six hundred sixty-two thousand, nine hundred eighty-nine".