287889839405 has 24 divisors (see below), whose sum is σ = 401894817048. Its totient is φ = 197398336128.

The previous prime is 287889839401. The next prime is 287889839431. The reversal of 287889839405 is 504938988782.

It can be written as a sum of positive squares in 4 ways, for example, as 133665553609 + 154224285796 = 365603^2 + 392714^2 .

It is not a de Polignac number, because 287889839405 - 2² = 287889839401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287889839401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6612167 + ... + 6655563.

It is an arithmetic number, because the mean of its divisors is an integer number (16745617377).

Almost surely, 2^287889839405 is an apocalyptic number.

It is an amenable number.

287889839405 is a deficient number, since it is larger than the sum of its proper divisors (114004977643).

287889839405 is a wasteful number, since it uses less digits than its factorization.

287889839405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70493 (or 70486 counting only the distinct ones).

The product of its (nonzero) digits is 278691840, while the sum is 71.

The spelling of 287889839405 in words is "two hundred eighty-seven billion, eight hundred eighty-nine million, eight hundred thirty-nine thousand, four hundred five".