28211325 has 24 divisors (see below), whose sum is σ = 46797600. Its totient is φ = 14996160.

The previous prime is 28211303. The next prime is 28211377. The reversal of 28211325 is 52311282.

It is not a de Polignac number, because 28211325 - 2²⁰ = 27162749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28211295 and 28211304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37806 + ... + 38544.

It is an arithmetic number, because the mean of its divisors is an integer number (1949900).

Almost surely, 2^28211325 is an apocalyptic number.

28211325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28211325 is a deficient number, since it is larger than the sum of its proper divisors (18586275).

28211325 is a wasteful number, since it uses less digits than its factorization.

28211325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261 (or 1256 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 28211325 is about 5311.4334223447. The cubic root of 28211325 is about 304.4209204133.

The spelling of 28211325 in words is "twenty-eight million, two hundred eleven thousand, three hundred twenty-five".