287380 has 12 divisors (see below), whose sum is σ = 603540. Its totient is φ = 114944.

The previous prime is 287347. The next prime is 287383. The reversal of 287380 is 83782.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 138384 + 148996 = 372^2 + 386^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7165 + ... + 7204.

It is an arithmetic number, because the mean of its divisors is an integer number (50295).

2²⁸⁷³⁸⁰ is an apocalyptic number.

287380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287380 is an abundant number, since it is smaller than the sum of its proper divisors (316160).

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

287380 is a wasteful number, since it uses less digits than its factorization.

287380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14378 (or 14376 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 287380 is about 536.0783524822. The cubic root of 287380 is about 65.9911221606.

The spelling of 287380 in words is "two hundred eighty-seven thousand, three hundred eighty".