689772640 has 48 divisors (see below), whose sum is σ = 1642077360. Its totient is φ = 273794560.

The previous prime is 689772631. The next prime is 689772641. The reversal of 689772640 is 46277986.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689772641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4506 + ... + 37414.

It is an arithmetic number, because the mean of its divisors is an integer number (34209945).

Almost surely, 2^689772640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689772640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821038680).

689772640 is an abundant number, since it is smaller than the sum of its proper divisors (952304720).

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

689772640 is a wasteful number, since it uses less digits than its factorization.

689772640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33055 (or 33047 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 689772640 is about 26263.5229929269. The cubic root of 689772640 is about 883.5585246044.

It can be divided in two parts, 68977 and 2640, that added together give a palindrome (71617).

The spelling of 689772640 in words is "six hundred eighty-nine million, seven hundred seventy-two thousand, six hundred forty".