689434746 has 128 divisors (see below), whose sum is σ = 1864138752. Its totient is φ = 164160000.

The previous prime is 689434717. The next prime is 689434763. The reversal of 689434746 is 647434986.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1146846 + ... + 1147446.

It is an arithmetic number, because the mean of its divisors is an integer number (14563584).

Almost surely, 2^689434746 is an apocalyptic number.

689434746 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 689434746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (932069376).

689434746 is an abundant number, since it is smaller than the sum of its proper divisors (1174704006).

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

689434746 is a wasteful number, since it uses less digits than its factorization.

689434746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828.

The product of its digits is 3483648, while the sum is 51.

The square root of 689434746 is about 26257.0894426629. The cubic root of 689434746 is about 883.4142268704.

The spelling of 689434746 in words is "six hundred eighty-nine million, four hundred thirty-four thousand, seven hundred forty-six".