28457111 has 8 divisors (see below), whose sum is σ = 28988400. Its totient is φ = 27929088.

The previous prime is 28457089. The next prime is 28457113. The reversal of 28457111 is 11175482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28457111 - 2⁶ = 28457047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28457113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22775 + ... + 23991.

It is an arithmetic number, because the mean of its divisors is an integer number (3623550).

Almost surely, 2^28457111 is an apocalyptic number.

28457111 is a deficient number, since it is larger than the sum of its proper divisors (531289).

28457111 is a wasteful number, since it uses less digits than its factorization.

28457111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633.

The product of its digits is 2240, while the sum is 29.

The square root of 28457111 is about 5334.5206907463. The cubic root of 28457111 is about 305.3024358314.

The spelling of 28457111 in words is "twenty-eight million, four hundred fifty-seven thousand, one hundred eleven".