864897287 has 4 divisors (see below), whose sum is σ = 915773616. Its totient is φ = 814020960.

The previous prime is 864897277. The next prime is 864897317. The reversal of 864897287 is 782798468.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864897287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864897217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25438139 + ... + 25438172.

It is an arithmetic number, because the mean of its divisors is an integer number (228943404).

Almost surely, 2^864897287 is an apocalyptic number.

864897287 is a deficient number, since it is larger than the sum of its proper divisors (50876329).

864897287 is a wasteful number, since it uses less digits than its factorization.

864897287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50876328.

The product of its digits is 10838016, while the sum is 59.

The square root of 864897287 is about 29409.1361144798. The cubic root of 864897287 is about 952.7702287586.

The spelling of 864897287 in words is "eight hundred sixty-four million, eight hundred ninety-seven thousand, two hundred eighty-seven".