823387679678 has 4 divisors (see below), whose sum is σ = 1235081519520. Its totient is φ = 411693839838.

The previous prime is 823387679657. The next prime is 823387679689. The reversal of 823387679678 is 876976783328.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205846919918 + ... + 205846919921.

It is an arithmetic number, because the mean of its divisors is an integer number (308770379880).

Almost surely, 2^823387679678 is an apocalyptic number.

823387679678 is a deficient number, since it is larger than the sum of its proper divisors (411693839842).

823387679678 is a wasteful number, since it uses less digits than its factorization.

823387679678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411693839841.

The product of its digits is 1024192512, while the sum is 74.

The spelling of 823387679678 in words is "eight hundred twenty-three billion, three hundred eighty-seven million, six hundred seventy-nine thousand, six hundred seventy-eight".