287890845 has 16 divisors (see below), whose sum is σ = 502500672. Its totient is φ = 139583360.

The previous prime is 287890829. The next prime is 287890849. The reversal of 287890845 is 548098782.

It is a happy number.

It is not a de Polignac number, because 287890845 - 2⁴ = 287890829 is a prime.

It is a super-2 number, since 2×287890845² = 165762277269628050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287890849) 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, 872232 + ... + 872561.

It is an arithmetic number, because the mean of its divisors is an integer number (31406292).

Almost surely, 2^287890845 is an apocalyptic number.

It is an amenable number.

287890845 is a deficient number, since it is larger than the sum of its proper divisors (214609827).

287890845 is a wasteful number, since it uses less digits than its factorization.

287890845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744812.

The product of its (nonzero) digits is 1290240, while the sum is 51.

The square root of 287890845 is about 16967.3464336649. The cubic root of 287890845 is about 660.3020082481.

The spelling of 287890845 in words is "two hundred eighty-seven million, eight hundred ninety thousand, eight hundred forty-five".