698862978 has 80 divisors (see below), whose sum is σ = 1798331040. Its totient is φ = 200620800.

The previous prime is 698862971. The next prime is 698862991. The reversal of 698862978 is 879268896.

698862978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (698862971) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 23538 + ... + 44178.

It is an arithmetic number, because the mean of its divisors is an integer number (22479138).

Almost surely, 2^698862978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 698862978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (899165520).

698862978 is an abundant number, since it is smaller than the sum of its proper divisors (1099468062).

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

698862978 is a wasteful number, since it uses less digits than its factorization.

698862978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20685 (or 20676 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The square root of 698862978 is about 26436.0166817923. The cubic root of 698862978 is about 887.4229953158.

The spelling of 698862978 in words is "six hundred ninety-eight million, eight hundred sixty-two thousand, nine hundred seventy-eight".