28926891 has 48 divisors (see below), whose sum is σ = 50319360. Its totient is φ = 15664320.

The previous prime is 28926883. The next prime is 28926899. The reversal of 28926891 is 19862982.

It is an interprime number because it is at equal distance from previous prime (28926883) and next prime (28926899).

It is not a de Polignac number, because 28926891 - 2³ = 28926883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28926899) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 129606 + ... + 129828.

It is an arithmetic number, because the mean of its divisors is an integer number (1048320).

Almost surely, 2^28926891 is an apocalyptic number.

28926891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28926891 is a deficient number, since it is larger than the sum of its proper divisors (21392469).

28926891 is a wasteful number, since it uses less digits than its factorization.

28926891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 333 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 28926891 is about 5378.3725233569. The cubic root of 28926891 is about 306.9732882855.

The spelling of 28926891 in words is "twenty-eight million, nine hundred twenty-six thousand, eight hundred ninety-one".