689171028 has 144 divisors (see below), whose sum is σ = 2038506624. Its totient is φ = 176463360.

The previous prime is 689171017. The next prime is 689171039. The reversal of 689171028 is 820171986.

It is an interprime number because it is at equal distance from previous prime (689171017) and next prime (689171039).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1494718 + ... + 1495178.

It is an arithmetic number, because the mean of its divisors is an integer number (14156296).

Almost surely, 2^689171028 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 689171028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019253312).

689171028 is an abundant number, since it is smaller than the sum of its proper divisors (1349335596).

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

689171028 is a wasteful number, since it uses less digits than its factorization.

689171028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 689171028 is about 26252.0671186099. The cubic root of 689171028 is about 883.3015732578.

The spelling of 689171028 in words is "six hundred eighty-nine million, one hundred seventy-one thousand, twenty-eight".