28392489 has 12 divisors (see below), whose sum is σ = 41085876. Its totient is φ = 18893952.

The previous prime is 28392487. The next prime is 28392491. The reversal of 28392489 is 98429382.

28392489 is a `hidden beast` number, since 2 + 83 + 92 + 489 = 666.

It is an interprime number because it is at equal distance from previous prime (28392487) and next prime (28392491).

It can be written as a sum of positive squares in 2 ways, for example, as 514089 + 27878400 = 717^2 + 5280^2 .

It is not a de Polignac number, because 28392489 - 2¹ = 28392487 is a prime.

It is a super-2 number, since 2×28392489² = 1612266863230242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28392487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2997 + ... + 8109.

It is an arithmetic number, because the mean of its divisors is an integer number (3423823).

Almost surely, 2^28392489 is an apocalyptic number.

It is an amenable number.

28392489 is a deficient number, since it is larger than the sum of its proper divisors (12693387).

28392489 is a wasteful number, since it uses less digits than its factorization.

28392489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5736 (or 5733 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 28392489 is about 5328.4602841722. The cubic root of 28392489 is about 305.0711613944.

The spelling of 28392489 in words is "twenty-eight million, three hundred ninety-two thousand, four hundred eighty-nine".