689759442 has 64 divisors (see below), whose sum is σ = 1570320000. Its totient is φ = 224351424.

The previous prime is 689759429. The next prime is 689759491. The reversal of 689759442 is 244957986.

689759442 is a `hidden beast` number, since 6 + 8 + 9 + 7 + 594 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 473988 + ... + 475440.

It is an arithmetic number, because the mean of its divisors is an integer number (24536250).

Almost surely, 2^689759442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689759442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (785160000).

689759442 is an abundant number, since it is smaller than the sum of its proper divisors (880560558).

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

689759442 is a wasteful number, since it uses less digits than its factorization.

689759442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672 (or 1666 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 689759442 is about 26263.2717306888. The cubic root of 689759442 is about 883.5528892791.

The spelling of 689759442 in words is "six hundred eighty-nine million, seven hundred fifty-nine thousand, four hundred forty-two".