689209722 has 28 divisors (see below), whose sum is σ = 1550016090. Its totient is φ = 229736088.

The previous prime is 689209691. The next prime is 689209727. The reversal of 689209722 is 227902986.

It can be written as a sum of positive squares in only one way, i.e., 648262521 + 40947201 = 25461^2 + 6399^2 .

It is not an unprimeable number, because it can be changed into a prime (689209727) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 234897 + ... + 237812.

Almost surely, 2^689209722 is an apocalyptic number.

689209722 is an abundant number, since it is smaller than the sum of its proper divisors (860806368).

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

689209722 is an equidigital number, since it uses as much as digits as its factorization.

689209722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472729 (or 472714 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 689209722 is about 26252.8040788027. The cubic root of 689209722 is about 883.3181041479.

The spelling of 689209722 in words is "six hundred eighty-nine million, two hundred nine thousand, seven hundred twenty-two".