1646140806 has 48 divisors (see below), whose sum is σ = 3714866064. Its totient is φ = 546321024.

The previous prime is 1646140789. The next prime is 1646140813. The reversal of 1646140806 is 6080416461.

1646140806 is a `hidden beast` number, since 1 + 646 + 1 + 4 + 0 + 8 + 0 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105970 + ... + 120506.

It is an arithmetic number, because the mean of its divisors is an integer number (77393043).

Almost surely, 2^1646140806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1646140806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1857433032).

1646140806 is an abundant number, since it is smaller than the sum of its proper divisors (2068725258).

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

1646140806 is a wasteful number, since it uses less digits than its factorization.

1646140806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14787 (or 14775 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1646140806 is about 40572.6608198181. The cubic root of 1646140806 is about 1180.7437631233.

The spelling of 1646140806 in words is "one billion, six hundred forty-six million, one hundred forty thousand, eight hundred six".