689928625 has 8 divisors (see below), whose sum is σ = 861031080. Its totient is φ = 551942800.

The previous prime is 689928601. The next prime is 689928637. The reversal of 689928625 is 526829986.

It can be written as a sum of positive squares in 4 ways, for example, as 58110129 + 631818496 = 7623^2 + 25136^2 .

It is not a de Polignac number, because 689928625 - 2¹³ = 689920433 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2759590 + ... + 2759839.

It is an arithmetic number, because the mean of its divisors is an integer number (107628885).

Almost surely, 2^689928625 is an apocalyptic number.

It is an amenable number.

689928625 is a deficient number, since it is larger than the sum of its proper divisors (171102455).

689928625 is an equidigital number, since it uses as much as digits as its factorization.

689928625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5519444 (or 5519434 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 55.

The square root of 689928625 is about 26266.4924380854. The cubic root of 689928625 is about 883.6251221472.

The spelling of 689928625 in words is "six hundred eighty-nine million, nine hundred twenty-eight thousand, six hundred twenty-five".