698978658 has 64 divisors (see below), whose sum is σ = 1618587648. Its totient is φ = 197112960.

The previous prime is 698978653. The next prime is 698978659. The reversal of 698978658 is 856879896.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (698978653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1904391 + ... + 1904757.

It is an arithmetic number, because the mean of its divisors is an integer number (25290432).

Almost surely, 2^698978658 is an apocalyptic number.

698978658 is an abundant number, since it is smaller than the sum of its proper divisors (919608990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

698978658 is a wasteful number, since it uses less digits than its factorization.

698978658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847.

The product of its digits is 52254720, while the sum is 66.

The square root of 698978658 is about 26438.2045154356. The cubic root of 698978658 is about 887.4719564768.

The spelling of 698978658 in words is "six hundred ninety-eight million, nine hundred seventy-eight thousand, six hundred fifty-eight".