868663779 has 4 divisors (see below), whose sum is σ = 1158218376. Its totient is φ = 579109184.

The previous prime is 868663753. The next prime is 868663801. The reversal of 868663779 is 977366868.

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

It is a cyclic number.

It is not a de Polignac number, because 868663779 - 2¹³ = 868655587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (868663079) 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, 144777294 + ... + 144777299.

It is an arithmetic number, because the mean of its divisors is an integer number (289554594).

Almost surely, 2^868663779 is an apocalyptic number.

868663779 is a deficient number, since it is larger than the sum of its proper divisors (289554597).

868663779 is a wasteful number, since it uses less digits than its factorization.

868663779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289554596.

The product of its digits is 18289152, while the sum is 60.

The square root of 868663779 is about 29473.1026361325. The cubic root of 868663779 is about 954.1512808979.

The spelling of 868663779 in words is "eight hundred sixty-eight million, six hundred sixty-three thousand, seven hundred seventy-nine".