689955761 has 16 divisors (see below), whose sum is σ = 818501760. Its totient is φ = 574375680.

The previous prime is 689955751. The next prime is 689955779. The reversal of 689955761 is 167559986.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689955761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 689955697 and 689955706.

It is not an unprimeable number, because it can be changed into a prime (689955751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42941 + ... + 56778.

It is an arithmetic number, because the mean of its divisors is an integer number (51156360).

Almost surely, 2^689955761 is an apocalyptic number.

It is an amenable number.

689955761 is a deficient number, since it is larger than the sum of its proper divisors (128545999).

689955761 is a wasteful number, since it uses less digits than its factorization.

689955761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99784.

The product of its digits is 4082400, while the sum is 56.

The square root of 689955761 is about 26267.0089846560. The cubic root of 689955761 is about 883.6367067934.

The spelling of 689955761 in words is "six hundred eighty-nine million, nine hundred fifty-five thousand, seven hundred sixty-one".