285328553 has 4 divisors (see below), whose sum is σ = 292287828. Its totient is φ = 278369280.

The previous prime is 285328541. The next prime is 285328573. The reversal of 285328553 is 355823582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355823582 = 2 ⋅177911791.

It can be written as a sum of positive squares in 2 ways, for example, as 23309584 + 262018969 = 4828^2 + 16187^2 .

It is a cyclic number.

It is not a de Polignac number, because 285328553 - 2⁸ = 285328297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 6959233 = 285328553 / (2 + 8 + 5 + 3 + 2 + 8 + 5 + 5 + 3).

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 285328553.

It is not an unprimeable number, because it can be changed into a prime (285328523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3479576 + ... + 3479657.

It is an arithmetic number, because the mean of its divisors is an integer number (73071957).

Almost surely, 2^285328553 is an apocalyptic number.

It is an amenable number.

285328553 is a deficient number, since it is larger than the sum of its proper divisors (6959275).

285328553 is an equidigital number, since it uses as much as digits as its factorization.

285328553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6959274.

The product of its digits is 288000, while the sum is 41.

The square root of 285328553 is about 16891.6711133031. The cubic root of 285328553 is about 658.3372231713.

The spelling of 285328553 in words is "two hundred eighty-five million, three hundred twenty-eight thousand, five hundred fifty-three".