671698806 has 16 divisors (see below), whose sum is σ = 1343912448. Its totient is φ = 223813800.

The previous prime is 671698799. The next prime is 671698823. The reversal of 671698806 is 608896176.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3310 + ... + 36801.

It is an arithmetic number, because the mean of its divisors is an integer number (83994528).

Almost surely, 2^671698806 is an apocalyptic number.

671698806 is an abundant number, since it is smaller than the sum of its proper divisors (672213642).

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

671698806 is a wasteful number, since it uses less digits than its factorization.

671698806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42907.

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 671698806 is about 25917.1527371353. The cubic root of 671698806 is about 875.7729468257.

The spelling of 671698806 in words is "six hundred seventy-one million, six hundred ninety-eight thousand, eight hundred six".