689275505 has 4 divisors (see below), whose sum is σ = 827130612. Its totient is φ = 551420400.

The previous prime is 689275493. The next prime is 689275507. The reversal of 689275505 is 505572986.

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 300120976 + 389154529 = 17324^2 + 19727^2 .

It is not a de Polignac number, because 689275505 - 2²⁴ = 672498289 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 689275505.

It is not an unprimeable number, because it can be changed into a prime (689275507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68927546 + ... + 68927555.

It is an arithmetic number, because the mean of its divisors is an integer number (206782653).

Almost surely, 2^689275505 is an apocalyptic number.

It is an amenable number.

689275505 is a deficient number, since it is larger than the sum of its proper divisors (137855107).

689275505 is a wasteful number, since it uses less digits than its factorization.

689275505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137855106.

The product of its (nonzero) digits is 756000, while the sum is 47.

The square root of 689275505 is about 26254.0569245974. The cubic root of 689275505 is about 883.3462066080.

The spelling of 689275505 in words is "six hundred eighty-nine million, two hundred seventy-five thousand, five hundred five".