287121345 has 32 divisors (see below), whose sum is σ = 527358720. Its totient is φ = 130671360.

The previous prime is 287121343. The next prime is 287121371. The reversal of 287121345 is 543121782.

It is not a de Polignac number, because 287121345 - 2¹ = 287121343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (287121343) 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, 18075 + ... + 30015.

It is an arithmetic number, because the mean of its divisors is an integer number (16479960).

Almost surely, 2^287121345 is an apocalyptic number.

It is an amenable number.

287121345 is a deficient number, since it is larger than the sum of its proper divisors (240237375).

287121345 is a wasteful number, since it uses less digits than its factorization.

287121345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12185.

The product of its digits is 13440, while the sum is 33.

The square root of 287121345 is about 16944.6553520572. The cubic root of 287121345 is about 659.7131788615.

The spelling of 287121345 in words is "two hundred eighty-seven million, one hundred twenty-one thousand, three hundred forty-five".