287680345 has 4 divisors (see below), whose sum is σ = 345216420. Its totient is φ = 230144272.

The previous prime is 287680303. The next prime is 287680357. The reversal of 287680345 is 543086782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 228251664 + 59428681 = 15108^2 + 7709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287680345 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28768030 + ... + 28768039.

It is an arithmetic number, because the mean of its divisors is an integer number (86304105).

Almost surely, 2^287680345 is an apocalyptic number.

It is an amenable number.

287680345 is a deficient number, since it is larger than the sum of its proper divisors (57536075).

287680345 is an equidigital number, since it uses as much as digits as its factorization.

287680345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57536074.

The product of its (nonzero) digits is 322560, while the sum is 43.

The square root of 287680345 is about 16961.1422080000. The cubic root of 287680345 is about 660.1410358225.

The spelling of 287680345 in words is "two hundred eighty-seven million, six hundred eighty thousand, three hundred forty-five".