285420581 has 8 divisors (see below), whose sum is σ = 296033400. Its totient is φ = 274859200.

The previous prime is 285420571. The next prime is 285420587. The reversal of 285420581 is 185024582.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 31528225 + 253892356 = 5615^2 + 15934^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 285420581 - 2¹⁰ = 285419557 is a prime.

It is a super-2 number, since 2×285420581² = 162929816116755122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285420587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1370 + ... + 23931.

It is an arithmetic number, because the mean of its divisors is an integer number (37004175).

Almost surely, 2^285420581 is an apocalyptic number.

It is an amenable number.

285420581 is a deficient number, since it is larger than the sum of its proper divisors (10612819).

285420581 is a wasteful number, since it uses less digits than its factorization.

285420581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25719.

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 285420581 is about 16894.3949580919. The cubic root of 285420581 is about 658.4079941531.

The spelling of 285420581 in words is "two hundred eighty-five million, four hundred twenty thousand, five hundred eighty-one".