285090681 has 16 divisors (see below), whose sum is σ = 397255680. Its totient is φ = 181518480.

The previous prime is 285090653. The next prime is 285090691. The reversal of 285090681 is 186090582.

It is not a de Polignac number, because 285090681 - 2¹¹ = 285088633 is a prime.

It is a super-2 number, since 2×285090681² = 162553392786087522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (285090691) 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, 48196 + ... + 53786.

It is an arithmetic number, because the mean of its divisors is an integer number (24828480).

Almost surely, 2^285090681 is an apocalyptic number.

It is an amenable number.

285090681 is a deficient number, since it is larger than the sum of its proper divisors (112164999).

285090681 is a wasteful number, since it uses less digits than its factorization.

285090681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6356.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 285090681 is about 16884.6285419609. The cubic root of 285090681 is about 658.1542253273.

Subtracting from 285090681 its reverse (186090582), we obtain a palindrome (99000099).

The spelling of 285090681 in words is "two hundred eighty-five million, ninety thousand, six hundred eighty-one".