287641327640 has 64 divisors (see below), whose sum is σ = 675751930560. Its totient is φ = 109985610240.

The previous prime is 287641327639. The next prime is 287641327657. The reversal of 287641327640 is 46723146782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1394882 + ... + 1587758.

It is an arithmetic number, because the mean of its divisors is an integer number (10558623915).

Almost surely, 2^287641327640 is an apocalyptic number.

287641327640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 287641327640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337875965280).

287641327640 is an abundant number, since it is smaller than the sum of its proper divisors (388110602920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

287641327640 is a wasteful number, since it uses less digits than its factorization.

287641327640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194532 (or 194528 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 50.

The spelling of 287641327640 in words is "two hundred eighty-seven billion, six hundred forty-one million, three hundred twenty-seven thousand, six hundred forty".