287028731 has 12 divisors (see below), whose sum is σ = 332628360. Its totient is φ = 245583360.

The previous prime is 287028727. The next prime is 287028733. The reversal of 287028731 is 137820782.

It is not a de Polignac number, because 287028731 - 2² = 287028727 is a prime.

It is a super-2 number, since 2×287028731² = 164770984838940722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287028733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41966 + ... + 48323.

It is an arithmetic number, because the mean of its divisors is an integer number (27719030).

Almost surely, 2^287028731 is an apocalyptic number.

287028731 is a deficient number, since it is larger than the sum of its proper divisors (45599629).

287028731 is a wasteful number, since it uses less digits than its factorization.

287028731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90334 (or 90317 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 287028731 is about 16941.9222935297. The cubic root of 287028731 is about 659.6422387660.

The spelling of 287028731 in words is "two hundred eighty-seven million, twenty-eight thousand, seven hundred thirty-one".