287591240449 has 4 divisors (see below), whose sum is σ = 287721198036. Its totient is φ = 287461282864.

The previous prime is 287591240441. The next prime is 287591240467. The reversal of 287591240449 is 944042195782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 176258908224 + 111332332225 = 419832^2 + 333665^2 .

It is a cyclic number.

It is not a de Polignac number, because 287591240449 - 2³ = 287591240441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 287591240449.

It is not an unprimeable number, because it can be changed into a prime (287591240441) 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, 64975474 + ... + 64979899.

It is an arithmetic number, because the mean of its divisors is an integer number (71930299509).

Almost surely, 2^287591240449 is an apocalyptic number.

It is an amenable number.

287591240449 is a deficient number, since it is larger than the sum of its proper divisors (129957587).

287591240449 is a wasteful number, since it uses less digits than its factorization.

287591240449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129957586.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 287591240449 in words is "two hundred eighty-seven billion, five hundred ninety-one million, two hundred forty thousand, four hundred forty-nine".