28489826 has 4 divisors (see below), whose sum is σ = 42734742. Its totient is φ = 14244912.

The previous prime is 28489823. The next prime is 28489829. The reversal of 28489826 is 62898482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62898482 = 2 ⋅31449241.

It is an interprime number because it is at equal distance from previous prime (28489823) and next prime (28489829).

It can be written as a sum of positive squares in only one way, i.e., 15880225 + 12609601 = 3985^2 + 3551^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28489823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7122455 + ... + 7122458.

Almost surely, 2^28489826 is an apocalyptic number.

28489826 is a deficient number, since it is larger than the sum of its proper divisors (14244916).

28489826 is a wasteful number, since it uses less digits than its factorization.

28489826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14244915.

The product of its digits is 442368, while the sum is 47.

The square root of 28489826 is about 5337.5861585552. The cubic root of 28489826 is about 305.4193854421.

The spelling of 28489826 in words is "twenty-eight million, four hundred eighty-nine thousand, eight hundred twenty-six".