28125385 has 8 divisors (see below), whose sum is σ = 34573896. Its totient is φ = 21951360.

The previous prime is 28125353. The next prime is 28125403. The reversal of 28125385 is 58352182.

It can be written as a sum of positive squares in 4 ways, for example, as 499849 + 27625536 = 707^2 + 5256^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28125385 - 2⁵ = 28125353 is a prime.

It is a super-4 number, since 4×28125385⁴ (a number of 31 digits) contains 4444 as substring.

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 28125385.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68394 + ... + 68803.

It is an arithmetic number, because the mean of its divisors is an integer number (4321737).

Almost surely, 2^28125385 is an apocalyptic number.

It is an amenable number.

28125385 is a deficient number, since it is larger than the sum of its proper divisors (6448511).

28125385 is a wasteful number, since it uses less digits than its factorization.

28125385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137243.

The product of its digits is 19200, while the sum is 34.

The square root of 28125385 is about 5303.3371569230. The cubic root of 28125385 is about 304.1114874155. Note that the first 3 decimals are identical.

The spelling of 28125385 in words is "twenty-eight million, one hundred twenty-five thousand, three hundred eighty-five".