689749085 has 4 divisors (see below), whose sum is σ = 827698908. Its totient is φ = 551799264.

The previous prime is 689749061. The next prime is 689749103. The reversal of 689749085 is 580947986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146579449 + 543169636 = 12107^2 + 23306^2 .

It is a cyclic number.

It is not a de Polignac number, because 689749085 - 2¹⁶ = 689683549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 689749085.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68974904 + ... + 68974913.

It is an arithmetic number, because the mean of its divisors is an integer number (206924727).

Almost surely, 2^689749085 is an apocalyptic number.

It is an amenable number.

689749085 is a deficient number, since it is larger than the sum of its proper divisors (137949823).

689749085 is a wasteful number, since it uses less digits than its factorization.

689749085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137949822.

The product of its (nonzero) digits is 4354560, while the sum is 56.

The square root of 689749085 is about 26263.0745534486. The cubic root of 689749085 is about 883.5484669629.

The spelling of 689749085 in words is "six hundred eighty-nine million, seven hundred forty-nine thousand, eighty-five".