689407665 has 32 divisors (see below), whose sum is σ = 1124737536. Its totient is φ = 360495360.

The previous prime is 689407639. The next prime is 689407709. The reversal of 689407665 is 566704986.

It is not a de Polignac number, because 689407665 - 2¹⁴ = 689391281 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 334779 + ... + 336831.

It is an arithmetic number, because the mean of its divisors is an integer number (35148048).

Almost surely, 2^689407665 is an apocalyptic number.

It is an amenable number.

689407665 is a deficient number, since it is larger than the sum of its proper divisors (435329871).

689407665 is a wasteful number, since it uses less digits than its factorization.

689407665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The square root of 689407665 is about 26256.5737483016. The cubic root of 689407665 is about 883.4026598807.

The spelling of 689407665 in words is "six hundred eighty-nine million, four hundred seven thousand, six hundred sixty-five".