28489831 has 2 divisors, whose sum is σ = 28489832. Its totient is φ = 28489830.

The previous prime is 28489829. The next prime is 28489859. The reversal of 28489831 is 13898482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28489831 - 2¹ = 28489829 is a prime.

It is a super-2 number, since 2×28489831² = 1623340940817122, which contains 22 as substring.

Together with 28489829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28489891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14244915 + 14244916.

It is an arithmetic number, because the mean of its divisors is an integer number (14244916).

Almost surely, 2^28489831 is an apocalyptic number.

28489831 is a deficient number, since it is larger than the sum of its proper divisors (1).

28489831 is an equidigital number, since it uses as much as digits as its factorization.

28489831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 43.

The square root of 28489831 is about 5337.5866269317. The cubic root of 28489831 is about 305.4194033092.

The spelling of 28489831 in words is "twenty-eight million, four hundred eighty-nine thousand, eight hundred thirty-one".