28645089 has 8 divisors (see below), whose sum is σ = 41665632. Its totient is φ = 17360640.

The previous prime is 28645087. The next prime is 28645093. The reversal of 28645089 is 98054682.

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

It is not a de Polignac number, because 28645089 - 2¹ = 28645087 is a prime.

It is a super-2 number, since 2×28645089² = 1641082247635842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28645089.

It is not an unprimeable number, because it can be changed into a prime (28645081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433984 + ... + 434049.

It is an arithmetic number, because the mean of its divisors is an integer number (5208204).

Almost surely, 2^28645089 is an apocalyptic number.

It is an amenable number.

28645089 is a deficient number, since it is larger than the sum of its proper divisors (13020543).

28645089 is a wasteful number, since it uses less digits than its factorization.

28645089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868047.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 28645089 is about 5352.1107051331. The cubic root of 28645089 is about 305.9732024036.

The spelling of 28645089 in words is "twenty-eight million, six hundred forty-five thousand, eighty-nine".