699956640 has 336 divisors, whose sum is σ = 2632617288. Its totient is φ = 175177728.

The previous prime is 699956627. The next prime is 699956641. The reversal of 699956640 is 46659996.

It is a happy number.

699956640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 611671824 + 88284816 = 24732^2 + 9396^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (699956641) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1982704 + ... + 1983056.

Almost surely, 2^699956640 is an apocalyptic number.

699956640 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 699956640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1316308644).

699956640 is an abundant number, since it is smaller than the sum of its proper divisors (1932660648).

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

699956640 is a wasteful number, since it uses less digits than its factorization.

699956640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 54.

The square root of 699956640 is about 26456.6936709786. The cubic root of 699956640 is about 887.8856682605.

The spelling of 699956640 in words is "six hundred ninety-nine million, nine hundred fifty-six thousand, six hundred forty".