689685801 has 32 divisors (see below), whose sum is σ = 1151159040. Its totient is φ = 358127616.

The previous prime is 689685793. The next prime is 689685803. The reversal of 689685801 is 108586986.

It is not a de Polignac number, because 689685801 - 2³ = 689685793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (689685803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22956 + ... + 43661.

It is an arithmetic number, because the mean of its divisors is an integer number (35973720).

Almost surely, 2^689685801 is an apocalyptic number.

It is an amenable number.

689685801 is a deficient number, since it is larger than the sum of its proper divisors (461473239).

689685801 is a wasteful number, since it uses less digits than its factorization.

689685801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66673.

The product of its (nonzero) digits is 829440, while the sum is 51.

The square root of 689685801 is about 26261.8697163778. The cubic root of 689685801 is about 883.5214444835.

It can be divided in two parts, 68 and 9685801, that added together give a palindrome (9685869).

The spelling of 689685801 in words is "six hundred eighty-nine million, six hundred eighty-five thousand, eight hundred one".