285131338 has 4 divisors (see below), whose sum is σ = 427697010. Its totient is φ = 142565668.

The previous prime is 285131333. The next prime is 285131339. The reversal of 285131338 is 833131582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 280127169 + 5004169 = 16737^2 + 2237^2 .

It is not an unprimeable number, because it can be changed into a prime (285131333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71282833 + ... + 71282836.

Almost surely, 2^285131338 is an apocalyptic number.

285131338 is a deficient number, since it is larger than the sum of its proper divisors (142565672).

285131338 is a wasteful number, since it uses less digits than its factorization.

285131338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142565671.

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

The square root of 285131338 is about 16885.8324639326. The cubic root of 285131338 is about 658.1855104659.

The spelling of 285131338 in words is "two hundred eighty-five million, one hundred thirty-one thousand, three hundred thirty-eight".