287042661 has 6 divisors (see below), whose sum is σ = 414617190. Its totient is φ = 191361768.

The previous prime is 287042653. The next prime is 287042663. The reversal of 287042661 is 166240782.

It can be written as a sum of positive squares in only one way, i.e., 282441636 + 4601025 = 16806^2 + 2145^2 .

It is not a de Polignac number, because 287042661 - 2³ = 287042653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287042663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15946806 + ... + 15946823.

It is an arithmetic number, because the mean of its divisors is an integer number (69102865).

Almost surely, 2^287042661 is an apocalyptic number.

It is an amenable number.

287042661 is a deficient number, since it is larger than the sum of its proper divisors (127574529).

287042661 is a wasteful number, since it uses less digits than its factorization.

287042661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31893635 (or 31893632 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 287042661 is about 16942.3333989153. Note that the first 4 decimals coincide. The cubic root of 287042661 is about 659.6529097857.

The spelling of 287042661 in words is "two hundred eighty-seven million, forty-two thousand, six hundred sixty-one".