689392665 has 48 divisors (see below), whose sum is σ = 1301423760. Its totient is φ = 335554560.

The previous prime is 689392661. The next prime is 689392667. The reversal of 689392665 is 566293986.

It can be written as a sum of positive squares in 8 ways, for example, as 3790809 + 685601856 = 1947^2 + 26184^2 .

It is not a de Polignac number, because 689392665 - 2² = 689392661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689392661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45445 + ... + 58685.

It is an arithmetic number, because the mean of its divisors is an integer number (27112995).

Almost surely, 2^689392665 is an apocalyptic number.

689392665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

689392665 is a deficient number, since it is larger than the sum of its proper divisors (612031095).

689392665 is a wasteful number, since it uses less digits than its factorization.

689392665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13354 (or 13351 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 689392665 is about 26256.2881039952. The cubic root of 689392665 is about 883.3962528656.

The spelling of 689392665 in words is "six hundred eighty-nine million, three hundred ninety-two thousand, six hundred sixty-five".