28578023 has 4 divisors (see below), whose sum is σ = 29350440. Its totient is φ = 27805608.

The previous prime is 28578019. The next prime is 28578031. The reversal of 28578023 is 32087582.

It is a happy number.

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 28578023 - 2² = 28578019 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 (28578083) 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, 386153 + ... + 386226.

It is an arithmetic number, because the mean of its divisors is an integer number (7337610).

Almost surely, 2^28578023 is an apocalyptic number.

28578023 is a deficient number, since it is larger than the sum of its proper divisors (772417).

28578023 is an equidigital number, since it uses as much as digits as its factorization.

28578023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772416.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28578023 is about 5345.8416549688. The cubic root of 28578023 is about 305.7342267770.

The spelling of 28578023 in words is "twenty-eight million, five hundred seventy-eight thousand, twenty-three".