28658431 has 2 divisors, whose sum is σ = 28658432. Its totient is φ = 28658430.

The previous prime is 28658429. The next prime is 28658459. The reversal of 28658431 is 13485682.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28658431 - 2¹ = 28658429 is a prime.

It is a super-2 number, since 2×28658431² = 1642611334763522, which contains 22 as substring.

Together with 28658429, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28658401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14329215 + 14329216.

It is an arithmetic number, because the mean of its divisors is an integer number (14329216).

Almost surely, 2^28658431 is an apocalyptic number.

28658431 is a deficient number, since it is larger than the sum of its proper divisors (1).

28658431 is an equidigital number, since it uses as much as digits as its factorization.

28658431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 37.

The square root of 28658431 is about 5353.3569841736. The cubic root of 28658431 is about 306.0206993274.

The spelling of 28658431 in words is "twenty-eight million, six hundred fifty-eight thousand, four hundred thirty-one".