28401325 has 6 divisors (see below), whose sum is σ = 35217674. Its totient is φ = 22721040.

The previous prime is 28401313. The next prime is 28401341. The reversal of 28401325 is 52310482.

It can be written as a sum of positive squares in 3 ways, for example, as 8277129 + 20124196 = 2877^2 + 4486^2 .

It is not a de Polignac number, because 28401325 - 2¹⁹ = 27877037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 1136053 = 28401325 / (2 + 8 + 4 + 0 + 1 + 3 + 2 + 5).

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 28401325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 568002 + ... + 568051.

Almost surely, 2^28401325 is an apocalyptic number.

28401325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28401325 is a deficient number, since it is larger than the sum of its proper divisors (6816349).

28401325 is a wasteful number, since it uses less digits than its factorization.

28401325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136063 (or 1136058 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28401325 is about 5329.2893522495. The cubic root of 28401325 is about 305.1028050824.

The spelling of 28401325 in words is "twenty-eight million, four hundred one thousand, three hundred twenty-five".