287764 has 6 divisors (see below), whose sum is σ = 503594. Its totient is φ = 143880.

The previous prime is 287747. The next prime is 287783. The reversal of 287764 is 467782.

It can be written as a sum of positive squares in only one way, i.e., 202500 + 85264 = 450^2 + 292^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35967 + ... + 35974.

2²⁸⁷⁷⁶⁴ is an apocalyptic number.

It is an amenable number.

287764 is a deficient number, since it is larger than the sum of its proper divisors (215830).

287764 is a wasteful number, since it uses less digits than its factorization.

287764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71945 (or 71943 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 287764 is about 536.4363895188. The cubic root of 287764 is about 66.0205017423.

It can be divided in two parts, 2 and 87764, that multiplied together give a triangular number (175528 = T₅₉₂).

The spelling of 287764 in words is "two hundred eighty-seven thousand, seven hundred sixty-four".