287121680 has 40 divisors (see below), whose sum is σ = 669546432. Its totient is φ = 114506624.

The previous prime is 287121677. The next prime is 287121697. The reversal of 287121680 is 86121782.

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

It is a self number, because there is not a number n which added to its sum of digits gives 287121680.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22589 + ... + 32931.

Almost surely, 2^287121680 is an apocalyptic number.

287121680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287121680 is an abundant number, since it is smaller than the sum of its proper divisors (382424752).

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

287121680 is a wasteful number, since it uses less digits than its factorization.

287121680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10703 (or 10697 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 287121680 is about 16944.6652371772. The cubic root of 287121680 is about 659.7134354357.

The spelling of 287121680 in words is "two hundred eighty-seven million, one hundred twenty-one thousand, six hundred eighty".