28725893 has 4 divisors (see below), whose sum is σ = 32829600. Its totient is φ = 24622188.

The previous prime is 28725881. The next prime is 28725899. The reversal of 28725893 is 39852782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28725893 - 2⁴ = 28725877 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 (28725899) 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, 2051843 + ... + 2051856.

It is an arithmetic number, because the mean of its divisors is an integer number (8207400).

Almost surely, 2^28725893 is an apocalyptic number.

It is an amenable number.

28725893 is a deficient number, since it is larger than the sum of its proper divisors (4103707).

28725893 is an equidigital number, since it uses as much as digits as its factorization.

28725893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103706.

The product of its digits is 241920, while the sum is 44.

The square root of 28725893 is about 5359.6541866057. The cubic root of 28725893 is about 306.2606355879.

The spelling of 28725893 in words is "twenty-eight million, seven hundred twenty-five thousand, eight hundred ninety-three".