689725705 has 16 divisors (see below), whose sum is σ = 874437120. Its totient is φ = 521413312.

The previous prime is 689725691. The next prime is 689725721. The reversal of 689725705 is 507527986.

It is a cyclic number.

It is not a de Polignac number, because 689725705 - 2⁷ = 689725577 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43789 + ... + 57418.

It is an arithmetic number, because the mean of its divisors is an integer number (54652320).

Almost surely, 2^689725705 is an apocalyptic number.

It is an amenable number.

689725705 is a deficient number, since it is larger than the sum of its proper divisors (184711415).

689725705 is a wasteful number, since it uses less digits than its factorization.

689725705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101288.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The square root of 689725705 is about 26262.6294380437. The cubic root of 689725705 is about 883.5384838173.

The spelling of 689725705 in words is "six hundred eighty-nine million, seven hundred twenty-five thousand, seven hundred five".