287849840 has 40 divisors (see below), whose sum is σ = 670053840. Its totient is φ = 115001856.

The previous prime is 287849827. The next prime is 287849843. The reversal of 287849840 is 48948782.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287849843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88727 + ... + 91913.

It is an arithmetic number, because the mean of its divisors is an integer number (16751346).

Almost surely, 2^287849840 is an apocalyptic number.

287849840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287849840 is an abundant number, since it is smaller than the sum of its proper divisors (382204000).

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

287849840 is a wasteful number, since it uses less digits than its factorization.

287849840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4329 (or 4323 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 50.

The square root of 287849840 is about 16966.1380402259. The cubic root of 287849840 is about 660.2706572808.

The spelling of 287849840 in words is "two hundred eighty-seven million, eight hundred forty-nine thousand, eight hundred forty".