28455841989 has 6 divisors (see below), whose sum is σ = 41102882886. Its totient is φ = 18970561320.

The previous prime is 28455841979. The next prime is 28455842027. The reversal of 28455841989 is 98914855482.

28455841989 is a `hidden beast` number, since 2 + 8 + 45 + 584 + 1 + 9 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20280608100 + 8175233889 = 142410^2 + 90417^2 .

It is not a de Polignac number, because 28455841989 - 2¹⁹ = 28455317701 is a prime.

It is a super-2 number, since 2×28455841989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28455841979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1580880102 + ... + 1580880119.

It is an arithmetic number, because the mean of its divisors is an integer number (6850480481).

Almost surely, 2^28455841989 is an apocalyptic number.

It is an amenable number.

28455841989 is a deficient number, since it is larger than the sum of its proper divisors (12647040897).

28455841989 is a wasteful number, since it uses less digits than its factorization.

28455841989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161760227 (or 3161760224 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 63.

The spelling of 28455841989 in words is "twenty-eight billion, four hundred fifty-five million, eight hundred forty-one thousand, nine hundred eighty-nine".