868787869 has 4 divisors (see below), whose sum is σ = 869014144. Its totient is φ = 868561596.

The previous prime is 868787851. The next prime is 868787911. The reversal of 868787869 is 968787868.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 868787869 - 2⁵ = 868787837 is a prime.

It is a super-2 number, since 2×868787869² = 1509584722643122322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868787849) 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, 107277 + ... + 115090.

It is an arithmetic number, because the mean of its divisors is an integer number (217253536).

Almost surely, 2^868787869 is an apocalyptic number.

It is an amenable number.

868787869 is a deficient number, since it is larger than the sum of its proper divisors (226275).

868787869 is a wasteful number, since it uses less digits than its factorization.

868787869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226274.

The product of its digits is 65028096, while the sum is 67.

The square root of 868787869 is about 29475.2077007101. The cubic root of 868787869 is about 954.1967127431.

Subtracting 868787869 from its reverse (968787868), we obtain a palindrome (99999999).

The spelling of 868787869 in words is "eight hundred sixty-eight million, seven hundred eighty-seven thousand, eight hundred sixty-nine".