678808534 has 4 divisors (see below), whose sum is σ = 1018212804. Its totient is φ = 339404266.

The previous prime is 678808513. The next prime is 678808567. The reversal of 678808534 is 435808876.

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 (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169702132 + ... + 169702135.

It is an arithmetic number, because the mean of its divisors is an integer number (254553201).

Almost surely, 2^678808534 is an apocalyptic number.

678808534 is a deficient number, since it is larger than the sum of its proper divisors (339404270).

678808534 is a wasteful number, since it uses less digits than its factorization.

678808534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339404269.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The square root of 678808534 is about 26053.9542872095. The cubic root of 678808534 is about 878.8520387746.

The spelling of 678808534 in words is "six hundred seventy-eight million, eight hundred eight thousand, five hundred thirty-four".