678395998 has 8 divisors (see below), whose sum is σ = 1162964592. Its totient is φ = 290741136.

The previous prime is 678395959. The next prime is 678396029. The reversal of 678395998 is 899593876.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×678395998² = 920442260204832008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24228415 + ... + 24228442.

It is an arithmetic number, because the mean of its divisors is an integer number (145370574).

Almost surely, 2^678395998 is an apocalyptic number.

678395998 is a deficient number, since it is larger than the sum of its proper divisors (484568594).

678395998 is a wasteful number, since it uses less digits than its factorization.

678395998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48456866.

The product of its digits is 29393280, while the sum is 64.

The square root of 678395998 is about 26046.0361283632. The cubic root of 678395998 is about 878.6739661873.

It can be divided in two parts, 67839 and 5998, that added together give a palindrome (73837).

The spelling of 678395998 in words is "six hundred seventy-eight million, three hundred ninety-five thousand, nine hundred ninety-eight".