285023681 has 4 divisors (see below), whose sum is σ = 285619200. Its totient is φ = 284428164.

The previous prime is 285023663. The next prime is 285023689. The reversal of 285023681 is 186320582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 285023681 - 2¹⁸ = 284761537 is a prime.

It is a super-2 number, since 2×285023681² = 162476997461579522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (285023689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297041 + ... + 297998.

It is an arithmetic number, because the mean of its divisors is an integer number (71404800).

Almost surely, 2^285023681 is an apocalyptic number.

It is an amenable number.

285023681 is a deficient number, since it is larger than the sum of its proper divisors (595519).

285023681 is an equidigital number, since it uses as much as digits as its factorization.

285023681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595518.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 285023681 is about 16882.6443722540. The cubic root of 285023681 is about 658.1026630340.

The spelling of 285023681 in words is "two hundred eighty-five million, twenty-three thousand, six hundred eighty-one".