7891222012 has 24 divisors (see below), whose sum is σ = 14172907392. Its totient is φ = 3843159600.

The previous prime is 7891221973. The next prime is 7891222021. The reversal of 7891222012 is 2102221987.

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, 143814 + ... + 190957.

It is an arithmetic number, because the mean of its divisors is an integer number (590537808).

Almost surely, 2^7891222012 is an apocalyptic number.

It is an amenable number.

7891222012 is a deficient number, since it is larger than the sum of its proper divisors (6281685380).

7891222012 is a wasteful number, since it uses less digits than its factorization.

7891222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334929 (or 334927 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 7891222012 is about 88832.5504080571. The cubic root of 7891222012 is about 1990.8937688706.

Adding to 7891222012 its reverse (2102221987), we get a palindrome (9993443999).

The spelling of 7891222012 in words is "seven billion, eight hundred ninety-one million, two hundred twenty-two thousand, twelve".