698988864 has 112 divisors (see below), whose sum is σ = 2238012288. Its totient is φ = 187957248.

The previous prime is 698988863. The next prime is 698988889. The reversal of 698988864 is 468889896.

It is a tau number, because it is divible by the number of its divisors (112).

It is a junction number, because it is equal to n+sod(n) for n = 698988795 and 698988804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (698988863) 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 15 ways as a sum of consecutive naturals, for example, 7552 + ... + 38144.

Almost surely, 2^698988864 is an apocalyptic number.

698988864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 698988864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1119006144).

698988864 is an abundant number, since it is smaller than the sum of its proper divisors (1539023424).

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

698988864 is a wasteful number, since it uses less digits than its factorization.

698988864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30632 (or 30622 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 66.

The square root of 698988864 is about 26438.3975308641. The cubic root of 698988864 is about 887.4762758718.

The spelling of 698988864 in words is "six hundred ninety-eight million, nine hundred eighty-eight thousand, eight hundred sixty-four".