689877923 has 4 divisors (see below), whose sum is σ = 788431920. Its totient is φ = 591323928.

The previous prime is 689877917. The next prime is 689877941. The reversal of 689877923 is 329778986.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 689877923 - 2¹⁰ = 689876899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689877983) 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, 49276988 + ... + 49277001.

It is an arithmetic number, because the mean of its divisors is an integer number (197107980).

Almost surely, 2^689877923 is an apocalyptic number.

689877923 is a deficient number, since it is larger than the sum of its proper divisors (98553997).

689877923 is an equidigital number, since it uses as much as digits as its factorization.

689877923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98553996.

The product of its digits is 9144576, while the sum is 59.

The square root of 689877923 is about 26265.5272743572. The cubic root of 689877923 is about 883.6034761118.

The spelling of 689877923 in words is "six hundred eighty-nine million, eight hundred seventy-seven thousand, nine hundred twenty-three".