28391425 has 6 divisors (see below), whose sum is σ = 35205398. Its totient is φ = 22713120.

The previous prime is 28391423. The next prime is 28391477. The reversal of 28391425 is 52419382.

It can be written as a sum of positive squares in 3 ways, for example, as 2166784 + 26224641 = 1472^2 + 5121^2 .

It is not a de Polignac number, because 28391425 - 2¹ = 28391423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28391423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 567804 + ... + 567853.

Almost surely, 2^28391425 is an apocalyptic number.

28391425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28391425 is a deficient number, since it is larger than the sum of its proper divisors (6813973).

28391425 is a wasteful number, since it uses less digits than its factorization.

28391425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135667 (or 1135662 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 28391425 is about 5328.3604420122. The cubic root of 28391425 is about 305.0673505300.

The spelling of 28391425 in words is "twenty-eight million, three hundred ninety-one thousand, four hundred twenty-five".