7897211806 has 16 divisors (see below), whose sum is σ = 12924085248. Its totient is φ = 3589259800.

The previous prime is 7897211797. The next prime is 7897211837. The reversal of 7897211806 is 6081127987.

It is a self number, because there is not a number n which added to its sum of digits gives 7897211806.

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, 356721 + ... + 378211.

It is an arithmetic number, because the mean of its divisors is an integer number (807755328).

Almost surely, 2^7897211806 is an apocalyptic number.

7897211806 is a deficient number, since it is larger than the sum of its proper divisors (5026873442).

7897211806 is a wasteful number, since it uses less digits than its factorization.

7897211806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38207.

The product of its (nonzero) digits is 338688, while the sum is 49.

The square root of 7897211806 is about 88866.2579723035. The cubic root of 7897211806 is about 1991.3973675777.

The spelling of 7897211806 in words is "seven billion, eight hundred ninety-seven million, two hundred eleven thousand, eight hundred six".