28258625 has 16 divisors (see below), whose sum is σ = 35490000. Its totient is φ = 22464000.

The previous prime is 28258603. The next prime is 28258627. The reversal of 28258625 is 52685282.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 19784704 + 8473921 = 4448^2 + 2911^2 .

It is not a de Polignac number, because 28258625 - 2¹⁴ = 28242241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28258627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22001 + ... + 23249.

It is an arithmetic number, because the mean of its divisors is an integer number (2218125).

Almost surely, 2^28258625 is an apocalyptic number.

28258625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28258625 is a deficient number, since it is larger than the sum of its proper divisors (7231375).

28258625 is a wasteful number, since it uses less digits than its factorization.

28258625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445 (or 1435 counting only the distinct ones).

The product of its digits is 76800, while the sum is 38.

The square root of 28258625 is about 5315.8842161958. The cubic root of 28258625 is about 304.5909593331.

The spelling of 28258625 in words is "twenty-eight million, two hundred fifty-eight thousand, six hundred twenty-five".