864642887 has 8 divisors (see below), whose sum is σ = 902651904. Its totient is φ = 826668568.

The previous prime is 864642871. The next prime is 864642907. The reversal of 864642887 is 788246468.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 864642887 - 2⁴ = 864642871 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 (864642847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51098 + ... + 65880.

It is an arithmetic number, because the mean of its divisors is an integer number (112831488).

Almost surely, 2^864642887 is an apocalyptic number.

864642887 is a deficient number, since it is larger than the sum of its proper divisors (38009017).

864642887 is a wasteful number, since it uses less digits than its factorization.

864642887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17349.

The product of its digits is 4128768, while the sum is 53.

The square root of 864642887 is about 29404.8106098305. The cubic root of 864642887 is about 952.6768039790.

The spelling of 864642887 in words is "eight hundred sixty-four million, six hundred forty-two thousand, eight hundred eighty-seven".