28557623 has 8 divisors (see below), whose sum is σ = 29265600. Its totient is φ = 27853920.

The previous prime is 28557553. The next prime is 28557643. The reversal of 28557623 is 32675582.

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 28557623 - 2⁸ = 28557367 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 (28557643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15533 + ... + 17273.

It is an arithmetic number, because the mean of its divisors is an integer number (3658200).

Almost surely, 2^28557623 is an apocalyptic number.

28557623 is a deficient number, since it is larger than the sum of its proper divisors (707977).

28557623 is a wasteful number, since it uses less digits than its factorization.

28557623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137.

The product of its digits is 100800, while the sum is 38.

The square root of 28557623 is about 5343.9332892543. The cubic root of 28557623 is about 305.6614615047.

The spelling of 28557623 in words is "twenty-eight million, five hundred fifty-seven thousand, six hundred twenty-three".