689920878 has 8 divisors (see below), whose sum is σ = 1379841768. Its totient is φ = 229973624.

The previous prime is 689920859. The next prime is 689920879. The reversal of 689920878 is 878029986.

It is a sphenic number, since it is the product of 3 distinct primes.

689920878 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689920879) 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, 57493401 + ... + 57493412.

It is an arithmetic number, because the mean of its divisors is an integer number (172480221).

Almost surely, 2^689920878 is an apocalyptic number.

689920878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689920878 is a wasteful number, since it uses less digits than its factorization.

689920878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114986818.

The product of its (nonzero) digits is 3483648, while the sum is 57.

The square root of 689920878 is about 26266.3449684192. The cubic root of 689920878 is about 883.6218148151.

The spelling of 689920878 in words is "six hundred eighty-nine million, nine hundred twenty thousand, eight hundred seventy-eight".