689969280 has 512 divisors, whose sum is σ = 2961100800. Its totient is φ = 131973120.

The previous prime is 689969257. The next prime is 689969321. The reversal of 689969280 is 82969986.

It is a self number, because there is not a number n which added to its sum of digits gives 689969280.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1921741 + ... + 1922099.

It is an arithmetic number, because the mean of its divisors is an integer number (5783400).

Almost surely, 2^689969280 is an apocalyptic number.

689969280 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 689969280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1480550400).

689969280 is an abundant number, since it is smaller than the sum of its proper divisors (2271131520).

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

689969280 is a wasteful number, since it uses less digits than its factorization.

689969280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 57.

The square root of 689969280 is about 26267.2663214123. The cubic root of 689969280 is about 883.6424780845.

It can be divided in two parts, 689 and 969280, that added together give a palindrome (969969).

The spelling of 689969280 in words is "six hundred eighty-nine million, nine hundred sixty-nine thousand, two hundred eighty".