28203125 has 24 divisors (see below), whose sum is σ = 37206936. Its totient is φ = 21375000.

The previous prime is 28203107. The next prime is 28203137. The reversal of 28203125 is 52130282.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 4 ways, for example, as 27899524 + 303601 = 5282^2 + 551^2 .

It is not a de Polignac number, because 28203125 - 2¹⁰ = 28202101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28203125.

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, 1484366 + ... + 1484384.

It is an arithmetic number, because the mean of its divisors is an integer number (1550289).

Almost surely, 2^28203125 is an apocalyptic number.

28203125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28203125 is a deficient number, since it is larger than the sum of its proper divisors (9003811).

28203125 is an frugal number, since it uses more digits than its factorization.

28203125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 24 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 28203125 is about 5310.6614465620. The cubic root of 28203125 is about 304.3914228806.

The spelling of 28203125 in words is "twenty-eight million, two hundred three thousand, one hundred twenty-five".