287042340 has 96 divisors (see below), whose sum is σ = 869863680. Its totient is φ = 70304256.

The previous prime is 287042321. The next prime is 287042341. The reversal of 287042340 is 43240782.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 287042298 and 287042307.

It is not an unprimeable number, because it can be changed into a prime (287042341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177817 + ... + 179423.

It is an arithmetic number, because the mean of its divisors is an integer number (9061080).

Almost surely, 2^287042340 is an apocalyptic number.

287042340 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 287042340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (434931840).

287042340 is an abundant number, since it is smaller than the sum of its proper divisors (582821340).

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

287042340 is a wasteful number, since it uses less digits than its factorization.

287042340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861 (or 1859 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 287042340 is about 16942.3239256012. The cubic root of 287042340 is about 659.6526638889.

The spelling of 287042340 in words is "two hundred eighty-seven million, forty-two thousand, three hundred forty".