28757023 has 4 divisors (see below), whose sum is σ = 29041848. Its totient is φ = 28472200.

The previous prime is 28757021. The next prime is 28757033. The reversal of 28757023 is 32075782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28757023 - 2¹ = 28757021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28757023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28757021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142261 + ... + 142462.

It is an arithmetic number, because the mean of its divisors is an integer number (7260462).

Almost surely, 2^28757023 is an apocalyptic number.

28757023 is a deficient number, since it is larger than the sum of its proper divisors (284825).

28757023 is a wasteful number, since it uses less digits than its factorization.

28757023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284824.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 28757023 is about 5362.5575055192. The cubic root of 28757023 is about 306.3712263097.

The spelling of 28757023 in words is "twenty-eight million, seven hundred fifty-seven thousand, twenty-three".