287421912 has 64 divisors (see below), whose sum is σ = 806208000. Its totient is φ = 94869792.

The previous prime is 287421899. The next prime is 287421913. The reversal of 287421912 is 219124782.

It is a super-2 number, since 2×287421912² = 165222710995471488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287421913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15789 + ... + 28707.

It is an arithmetic number, because the mean of its divisors is an integer number (12597000).

Almost surely, 2^287421912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 287421912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403104000).

287421912 is an abundant number, since it is smaller than the sum of its proper divisors (518786088).

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

287421912 is a wasteful number, since it uses less digits than its factorization.

287421912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13037 (or 13027 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 287421912 is about 16953.5221119389. The cubic root of 287421912 is about 659.9433009144.

The spelling of 287421912 in words is "two hundred eighty-seven million, four hundred twenty-one thousand, nine hundred twelve".