28673891 has 2 divisors, whose sum is σ = 28673892. Its totient is φ = 28673890.

The previous prime is 28673857. The next prime is 28673899. The reversal of 28673891 is 19837682.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28673891 is a prime.

It is a super-3 number, since 3×28673891³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (28673899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14336945 + 14336946.

It is an arithmetic number, because the mean of its divisors is an integer number (14336946).

Almost surely, 2^28673891 is an apocalyptic number.

28673891 is a deficient number, since it is larger than the sum of its proper divisors (1).

28673891 is an equidigital number, since it uses as much as digits as its factorization.

28673891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 28673891 is about 5354.8007432583. The cubic root of 28673891 is about 306.0757178026.

The spelling of 28673891 in words is "twenty-eight million, six hundred seventy-three thousand, eight hundred ninety-one".