698728678 has 4 divisors (see below), whose sum is σ = 1048093020. Its totient is φ = 349364338.

The previous prime is 698728651. The next prime is 698728691. The reversal of 698728678 is 876827896.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 174682168 + ... + 174682171.

It is an arithmetic number, because the mean of its divisors is an integer number (262023255).

Almost surely, 2^698728678 is an apocalyptic number.

698728678 is a deficient number, since it is larger than the sum of its proper divisors (349364342).

698728678 is a wasteful number, since it uses less digits than its factorization.

698728678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349364341.

The product of its digits is 16257024, while the sum is 61.

The square root of 698728678 is about 26433.4764645137. The cubic root of 698728678 is about 887.3661465261.

The spelling of 698728678 in words is "six hundred ninety-eight million, seven hundred twenty-eight thousand, six hundred seventy-eight".