28719873 has 32 divisors (see below), whose sum is σ = 52371200. Its totient is φ = 15147648.

The previous prime is 28719871. The next prime is 28719931. The reversal of 28719873 is 37891782.

It is not a de Polignac number, because 28719873 - 2¹ = 28719871 is a prime.

It is a super-2 number, since 2×28719873² = 1649662210272258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28719871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3388 + ... + 8301.

It is an arithmetic number, because the mean of its divisors is an integer number (1636600).

Almost surely, 2^28719873 is an apocalyptic number.

It is an amenable number.

28719873 is a deficient number, since it is larger than the sum of its proper divisors (23651327).

28719873 is a wasteful number, since it uses less digits than its factorization.

28719873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11718 (or 11712 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 28719873 is about 5359.0925537818. The cubic root of 28719873 is about 306.2392400496.

It can be divided in two parts, 28719 and 873, that added together give a palindrome (29592).

The spelling of 28719873 in words is "twenty-eight million, seven hundred nineteen thousand, eight hundred seventy-three".