285138498 has 32 divisors (see below), whose sum is σ = 615600000. Its totient is φ = 87777536.

The previous prime is 285138493. The next prime is 285138499. The reversal of 285138498 is 894831582.

It is not an unprimeable number, because it can be changed into a prime (285138493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31623 + ... + 39626.

It is an arithmetic number, because the mean of its divisors is an integer number (19237500).

Almost surely, 2^285138498 is an apocalyptic number.

285138498 is an abundant number, since it is smaller than the sum of its proper divisors (330461502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

285138498 is a wasteful number, since it uses less digits than its factorization.

285138498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71306.

The product of its digits is 552960, while the sum is 48.

The square root of 285138498 is about 16886.0444746542. The cubic root of 285138498 is about 658.1910197035.

The spelling of 285138498 in words is "two hundred eighty-five million, one hundred thirty-eight thousand, four hundred ninety-eight".