699559380 has 144 divisors (see below), whose sum is σ = 2298550800. Its totient is φ = 171196416.

The previous prime is 699559369. The next prime is 699559403. The reversal of 699559380 is 83955996.

699559380 is a `hidden beast` number, since 6 + 9 + 9 + 559 + 3 + 80 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 151437636 + 548121744 = 12306^2 + 23412^2 .

It is a super-2 number, since 2×699559380² = 978766652291968800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 450846 + ... + 452394.

Almost surely, 2^699559380 is an apocalyptic number.

699559380 is a gapful number since it is divisible by the number (60) 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 699559380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149275400).

699559380 is an abundant number, since it is smaller than the sum of its proper divisors (1598991420).

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

699559380 is a wasteful number, since it uses less digits than its factorization.

699559380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770 (or 1765 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 54.

The square root of 699559380 is about 26449.1848645662. The cubic root of 699559380 is about 887.7176634678.

The spelling of 699559380 in words is "six hundred ninety-nine million, five hundred fifty-nine thousand, three hundred eighty".