3218395816 has 8 divisors (see below), whose sum is σ = 6034492170. Its totient is φ = 1609197904.

The previous prime is 3218395801. The next prime is 3218395823. The reversal of 3218395816 is 6185938123.

It can be written as a sum of positive squares in only one way, i.e., 3213756100 + 4639716 = 56690^2 + 2154^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201149731 + ... + 201149746.

Almost surely, 2^3218395816 is an apocalyptic number.

It is an amenable number.

3218395816 is a deficient number, since it is larger than the sum of its proper divisors (2816096354).

3218395816 is a wasteful number, since it uses less digits than its factorization.

3218395816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402299483 (or 402299479 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The square root of 3218395816 is about 56730.9070613189. The cubic root of 3218395816 is about 1476.4309875530.

The spelling of 3218395816 in words is "three billion, two hundred eighteen million, three hundred ninety-five thousand, eight hundred sixteen".