28725873 has 16 divisors (see below), whose sum is σ = 43600896. Its totient is φ = 16652240.

The previous prime is 28725857. The next prime is 28725877. The reversal of 28725873 is 37852782.

It is not a de Polignac number, because 28725873 - 2⁴ = 28725857 is a prime.

It is a super-2 number, since 2×28725873² = 1650351559224258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28725877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18165 + ... + 19682.

It is an arithmetic number, because the mean of its divisors is an integer number (2725056).

Almost surely, 2^28725873 is an apocalyptic number.

28725873 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28725873 is a deficient number, since it is larger than the sum of its proper divisors (14875023).

28725873 is a wasteful number, since it uses less digits than its factorization.

28725873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37884.

The product of its digits is 188160, while the sum is 42.

The square root of 28725873 is about 5359.6523208134. The cubic root of 28725873 is about 306.2605645113.

The spelling of 28725873 in words is "twenty-eight million, seven hundred twenty-five thousand, eight hundred seventy-three".