287428521 has 8 divisors (see below), whose sum is σ = 388488160. Its totient is φ = 188993952.

The previous prime is 287428517. The next prime is 287428529. The reversal of 287428521 is 125824782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 287428521 - 2² = 287428517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 287428521.

It is not an unprimeable number, because it can be changed into a prime (287428529) 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, 656011 + ... + 656448.

It is an arithmetic number, because the mean of its divisors is an integer number (48561020).

Almost surely, 2^287428521 is an apocalyptic number.

It is an amenable number.

287428521 is a deficient number, since it is larger than the sum of its proper divisors (101059639).

287428521 is a wasteful number, since it uses less digits than its factorization.

287428521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312535.

The product of its digits is 71680, while the sum is 39.

The square root of 287428521 is about 16953.7170260684. The cubic root of 287428521 is about 659.9483591368.

The spelling of 287428521 in words is "two hundred eighty-seven million, four hundred twenty-eight thousand, five hundred twenty-one".