287487640 has 64 divisors (see below), whose sum is σ = 708549120. Its totient is φ = 104112000.

The previous prime is 287487631. The next prime is 287487647. The reversal of 287487640 is 46784782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287487647) 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, 118035 + ... + 120445.

It is an arithmetic number, because the mean of its divisors is an integer number (11071080).

Almost surely, 2^287487640 is an apocalyptic number.

287487640 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 287487640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354274560).

287487640 is an abundant number, since it is smaller than the sum of its proper divisors (421061480).

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

287487640 is a wasteful number, since it uses less digits than its factorization.

287487640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2704 (or 2700 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 46.

The square root of 287487640 is about 16955.4604773801. The cubic root of 287487640 is about 659.9936026316.

The spelling of 287487640 in words is "two hundred eighty-seven million, four hundred eighty-seven thousand, six hundred forty".