678858706 has 4 divisors (see below), whose sum is σ = 1018288062. Its totient is φ = 339429352.

The previous prime is 678858643. The next prime is 678858727. The reversal of 678858706 is 607858876.

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

It can be written as a sum of positive squares in only one way, i.e., 671069025 + 7789681 = 25905^2 + 2791^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169714675 + ... + 169714678.

Almost surely, 2^678858706 is an apocalyptic number.

678858706 is a deficient number, since it is larger than the sum of its proper divisors (339429356).

678858706 is a wasteful number, since it uses less digits than its factorization.

678858706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339429355.

The product of its (nonzero) digits is 4515840, while the sum is 55.

The square root of 678858706 is about 26054.9171175039. The cubic root of 678858706 is about 878.8736907703.

The spelling of 678858706 in words is "six hundred seventy-eight million, eight hundred fifty-eight thousand, seven hundred six".