678263869 has 4 divisors (see below), whose sum is σ = 678319744. Its totient is φ = 678207996.

The previous prime is 678263857. The next prime is 678263921. The reversal of 678263869 is 968362876.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 678263869 - 2⁵ = 678263837 is a prime.

It is a super-2 number, since 2×678263869² = 920083751981698322, 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 (678263809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1197 + ... + 36850.

It is an arithmetic number, because the mean of its divisors is an integer number (169579936).

Almost surely, 2^678263869 is an apocalyptic number.

It is an amenable number.

678263869 is a deficient number, since it is larger than the sum of its proper divisors (55875).

678263869 is a wasteful number, since it uses less digits than its factorization.

678263869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55874.

The product of its digits is 5225472, while the sum is 55.

The square root of 678263869 is about 26043.4995536314. The cubic root of 678263869 is about 878.6169169854.

The spelling of 678263869 in words is "six hundred seventy-eight million, two hundred sixty-three thousand, eight hundred sixty-nine".