285287379129 has 45 divisors (see below), whose sum is σ = 452843215231. Its totient is φ = 178952569920.

The previous prime is 285287379121. The next prime is 285287379131. The reversal of 285287379129 is 921973782582.

The square root of 285287379129 is 534123.

It is a perfect power (a square), and thus also a powerful number.

285287379129 is a `hidden beast` number, since 28 + 528 + 7 + 3 + 79 + 12 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 222109551225 + 63177827904 = 471285^2 + 251352^2 .

It is not a de Polignac number, because 285287379129 - 2³ = 285287379121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285287379121) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 81719074 + ... + 81722564.

Almost surely, 2^285287379129 is an apocalyptic number.

285287379129 is the 534123-rd square number.

285287379129 is the 267062-nd centered octagonal number.

It is an amenable number.

285287379129 is a deficient number, since it is larger than the sum of its proper divisors (167555836102).

285287379129 is an frugal number, since it uses more digits than its factorization.

285287379129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7028 (or 3511 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The spelling of 285287379129 in words is "two hundred eighty-five billion, two hundred eighty-seven million, three hundred seventy-nine thousand, one hundred twenty-nine".