285089749 has 24 divisors (see below), whose sum is σ = 342268160. Its totient is φ = 232569792.

The previous prime is 285089743. The next prime is 285089797. The reversal of 285089749 is 947980582.

It is not a de Polignac number, because 285089749 - 2³ = 285089741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 285089696 and 285089705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285089741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 464767 + ... + 465379.

Almost surely, 2^285089749 is an apocalyptic number.

285089749 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

285089749 is a deficient number, since it is larger than the sum of its proper divisors (57178411).

285089749 is an equidigital number, since it uses as much as digits as its factorization.

285089749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 52.

The square root of 285089749 is about 16884.6009428710. The cubic root of 285089749 is about 658.1535081281.

The spelling of 285089749 in words is "two hundred eighty-five million, eighty-nine thousand, seven hundred forty-nine".