689421284 has 12 divisors (see below), whose sum is σ = 1206781884. Its totient is φ = 344626464.

The previous prime is 689421233. The next prime is 689421287. The reversal of 689421284 is 482124986.

It can be written as a sum of positive squares in 2 ways, for example, as 100000000 + 589421284 = 10000^2 + 24278^2 .

It is not an unprimeable number, because it can be changed into a prime (689421287) 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 3 ways as a sum of consecutive naturals, for example, 359 + ... + 37134.

It is an arithmetic number, because the mean of its divisors is an integer number (100565157).

Almost surely, 2^689421284 is an apocalyptic number.

It is an amenable number.

689421284 is a deficient number, since it is larger than the sum of its proper divisors (517360600).

689421284 is a wasteful number, since it uses less digits than its factorization.

689421284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42094 (or 42092 counting only the distinct ones).

The product of its digits is 221184, while the sum is 44.

The square root of 689421284 is about 26256.8330915973. The cubic root of 689421284 is about 883.4084769428.

The spelling of 689421284 in words is "six hundred eighty-nine million, four hundred twenty-one thousand, two hundred eighty-four".