28111625 has 16 divisors (see below), whose sum is σ = 37149840. Its totient is φ = 21164800.

The previous prime is 28111613. The next prime is 28111627. The reversal of 28111625 is 52611182.

It can be written as a sum of positive squares in 8 ways, for example, as 190969 + 27920656 = 437^2 + 5284^2 .

It is not a de Polignac number, because 28111625 - 2¹² = 28107529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28111594 and 28111603.

It is not an unprimeable number, because it can be changed into a prime (28111627) 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, 4490 + ... + 8739.

It is an arithmetic number, because the mean of its divisors is an integer number (2321865).

Almost surely, 2^28111625 is an apocalyptic number.

28111625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28111625 is a deficient number, since it is larger than the sum of its proper divisors (9038215).

28111625 is a wasteful number, since it uses less digits than its factorization.

28111625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13261 (or 13251 counting only the distinct ones).

The product of its digits is 960, while the sum is 26.

The square root of 28111625 is about 5302.0397018506. The cubic root of 28111625 is about 304.0618850525.

The spelling of 28111625 in words is "twenty-eight million, one hundred eleven thousand, six hundred twenty-five".