28246891 has 2 divisors, whose sum is σ = 28246892. Its totient is φ = 28246890.

The previous prime is 28246861. The next prime is 28246913. The reversal of 28246891 is 19864282.

28246891 = T₄₃₃₈ + T₄₃₃₉ + T₄₃₄₀.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28246891 is a prime.

It is not a weakly prime, because it can be changed into another prime (28246811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14123445 + 14123446.

It is an arithmetic number, because the mean of its divisors is an integer number (14123446).

Almost surely, 2^28246891 is an apocalyptic number.

28246891 is the 4340-th centered triangular number.

28246891 is a deficient number, since it is larger than the sum of its proper divisors (1).

28246891 is an equidigital number, since it uses as much as digits as its factorization.

28246891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 40.

The square root of 28246891 is about 5314.7804282021. The cubic root of 28246891 is about 304.5487944469.

The spelling of 28246891 in words is "twenty-eight million, two hundred forty-six thousand, eight hundred ninety-one".