285138512 has 20 divisors (see below), whose sum is σ = 552732480. Its totient is φ = 142497888.

The previous prime is 285138509. The next prime is 285138523. The reversal of 285138512 is 215831582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45353 + ... + 51255.

It is an arithmetic number, because the mean of its divisors is an integer number (27636624).

Almost surely, 2^285138512 is an apocalyptic number.

It is an amenable number.

285138512 is a deficient number, since it is larger than the sum of its proper divisors (267593968).

285138512 is a wasteful number, since it uses less digits than its factorization.

285138512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8930 (or 8924 counting only the distinct ones).

The product of its digits is 19200, while the sum is 35.

The square root of 285138512 is about 16886.0448891977. The cubic root of 285138512 is about 658.1910304756.

The spelling of 285138512 in words is "two hundred eighty-five million, one hundred thirty-eight thousand, five hundred twelve".