689731038 has 80 divisors (see below), whose sum is σ = 1707726240. Its totient is φ = 206959104.

The previous prime is 689731037. The next prime is 689731057. The reversal of 689731038 is 830137986.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 689730984 and 689731002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689731033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 57898 + ... + 68786.

It is an arithmetic number, because the mean of its divisors is an integer number (21346578).

Almost surely, 2^689731038 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689731038, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (853863120).

689731038 is an abundant number, since it is smaller than the sum of its proper divisors (1017995202).

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

689731038 is a wasteful number, since it uses less digits than its factorization.

689731038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10943 (or 10934 counting only the distinct ones).

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

The square root of 689731038 is about 26262.7309699506. The cubic root of 689731038 is about 883.5407610020.

It can be divided in two parts, 6897 and 31038, that multiplied together give a triangular number (214069086 = T₂₀₆₉₁).

The spelling of 689731038 in words is "six hundred eighty-nine million, seven hundred thirty-one thousand, thirty-eight".