28513875 has 32 divisors (see below), whose sum is σ = 51105600. Its totient is φ = 14035200.

The previous prime is 28513871. The next prime is 28513883. The reversal of 28513875 is 57831582.

28513875 = 1475² + 1476² + ... + 1487².

It is not a de Polignac number, because 28513875 - 2² = 28513871 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (28513871) 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 31 ways as a sum of consecutive naturals, for example, 1951 + ... + 7799.

It is an arithmetic number, because the mean of its divisors is an integer number (1597050).

Almost surely, 2^28513875 is an apocalyptic number.

28513875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28513875 is a deficient number, since it is larger than the sum of its proper divisors (22591725).

28513875 is a wasteful number, since it uses less digits than its factorization.

28513875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5880 (or 5870 counting only the distinct ones).

The product of its digits is 67200, while the sum is 39.

The square root of 28513875 is about 5339.8384807033. The cubic root of 28513875 is about 305.5052987439.

The spelling of 28513875 in words is "twenty-eight million, five hundred thirteen thousand, eight hundred seventy-five".