28457087 has 4 divisors (see below), whose sum is σ = 28501320. Its totient is φ = 28412856.

The previous prime is 28457071. The next prime is 28457089. The reversal of 28457087 is 78075482.

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 28457087 - 2⁴ = 28457071 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 (28457089) 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, 21137 + ... + 22442.

It is an arithmetic number, because the mean of its divisors is an integer number (7125330).

Almost surely, 2^28457087 is an apocalyptic number.

28457087 is a deficient number, since it is larger than the sum of its proper divisors (44233).

28457087 is an equidigital number, since it uses as much as digits as its factorization.

28457087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44232.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 28457087 is about 5334.5184412466. The cubic root of 28457087 is about 305.3023500032.

The spelling of 28457087 in words is "twenty-eight million, four hundred fifty-seven thousand, eighty-seven".