287398645 has 4 divisors (see below), whose sum is σ = 344878380. Its totient is φ = 229918912.

The previous prime is 287398637. The next prime is 287398649. The reversal of 287398645 is 546893782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546893782 = 2 ⋅273446891.

It can be written as a sum of positive squares in 2 ways, for example, as 47210641 + 240188004 = 6871^2 + 15498^2 .

It is a cyclic number.

It is not a de Polignac number, because 287398645 - 2³ = 287398637 is a prime.

It is a super-2 number, since 2×287398645² = 165195962295672050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 287398592 and 287398601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287398649) 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, 28739860 + ... + 28739869.

It is an arithmetic number, because the mean of its divisors is an integer number (86219595).

Almost surely, 2^287398645 is an apocalyptic number.

It is an amenable number.

287398645 is a deficient number, since it is larger than the sum of its proper divisors (57479735).

287398645 is an equidigital number, since it uses as much as digits as its factorization.

287398645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57479734.

The product of its digits is 2903040, while the sum is 52.

The square root of 287398645 is about 16952.8358984566. The cubic root of 287398645 is about 659.9254928136.

The spelling of 287398645 in words is "two hundred eighty-seven million, three hundred ninety-eight thousand, six hundred forty-five".