287421984 has 72 divisors (see below), whose sum is σ = 852913152. Its totient is φ = 91639680.

The previous prime is 287421983. The next prime is 287422001. The reversal of 287421984 is 489124782.

287421984 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×287421984² = 165222793772992512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (287421983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15072 + ... + 28319.

It is an arithmetic number, because the mean of its divisors is an integer number (11846016).

Almost surely, 2^287421984 is an apocalyptic number.

287421984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

287421984 is an abundant number, since it is smaller than the sum of its proper divisors (565491168).

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

287421984 is a wasteful number, since it uses less digits than its factorization.

287421984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43430 (or 43419 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 287421984 is about 16953.5242353913. The cubic root of 287421984 is about 659.9433560203.

The spelling of 287421984 in words is "two hundred eighty-seven million, four hundred twenty-one thousand, nine hundred eighty-four".