689910797 has 4 divisors (see below), whose sum is σ = 712166016. Its totient is φ = 667655580.

The previous prime is 689910757. The next prime is 689910811. The reversal of 689910797 is 797019986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 689910797 - 2⁶ = 689910733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689910757) 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, 11127563 + ... + 11127624.

It is an arithmetic number, because the mean of its divisors is an integer number (178041504).

Almost surely, 2^689910797 is an apocalyptic number.

It is an amenable number.

689910797 is a deficient number, since it is larger than the sum of its proper divisors (22255219).

689910797 is a wasteful number, since it uses less digits than its factorization.

689910797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22255218.

The product of its (nonzero) digits is 1714608, while the sum is 56.

The square root of 689910797 is about 26266.1530681598. The cubic root of 689910797 is about 883.6175110197.

The spelling of 689910797 in words is "six hundred eighty-nine million, nine hundred ten thousand, seven hundred ninety-seven".