678581998 has 16 divisors (see below), whose sum is σ = 1100405520. Its totient is φ = 312745536.

The previous prime is 678581993. The next prime is 678581999. The reversal of 678581998 is 899185876.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678581993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239911 + ... + 242722.

It is an arithmetic number, because the mean of its divisors is an integer number (68775345).

Almost surely, 2^678581998 is an apocalyptic number.

678581998 is a deficient number, since it is larger than the sum of its proper divisors (421823522).

678581998 is a wasteful number, since it uses less digits than its factorization.

678581998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482691.

The product of its digits is 8709120, while the sum is 61.

The square root of 678581998 is about 26049.6064845517. The cubic root of 678581998 is about 878.7542626631.

The spelling of 678581998 in words is "six hundred seventy-eight million, five hundred eighty-one thousand, nine hundred ninety-eight".