287634561 has 16 divisors (see below), whose sum is σ = 393310080. Its totient is φ = 186919040.

The previous prime is 287634547. The next prime is 287634587. The reversal of 287634561 is 165436782.

It is a cyclic number.

It is not a de Polignac number, because 287634561 - 2⁷ = 287634433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (287634661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11371 + ... + 26543.

It is an arithmetic number, because the mean of its divisors is an integer number (24581880).

Almost surely, 2^287634561 is an apocalyptic number.

It is an amenable number.

287634561 is a deficient number, since it is larger than the sum of its proper divisors (105675519).

287634561 is a wasteful number, since it uses less digits than its factorization.

287634561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15336.

The product of its digits is 241920, while the sum is 42.

The square root of 287634561 is about 16959.7924810417. The cubic root of 287634561 is about 660.1060137326.

The spelling of 287634561 in words is "two hundred eighty-seven million, six hundred thirty-four thousand, five hundred sixty-one".