28891266 has 16 divisors (see below), whose sum is σ = 60295104. Its totient is φ = 9211664.

The previous prime is 28891259. The next prime is 28891273. The reversal of 28891266 is 66219882.

It is an interprime number because it is at equal distance from previous prime (28891259) and next prime (28891273).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104541 + ... + 104816.

It is an arithmetic number, because the mean of its divisors is an integer number (3768444).

Almost surely, 2^28891266 is an apocalyptic number.

28891266 is an abundant number, since it is smaller than the sum of its proper divisors (31403838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28891266 is a wasteful number, since it uses less digits than its factorization.

28891266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209385.

The product of its digits is 82944, while the sum is 42.

The square root of 28891266 is about 5375.0596275762. The cubic root of 28891266 is about 306.8472185573.

The spelling of 28891266 in words is "twenty-eight million, eight hundred ninety-one thousand, two hundred sixty-six".