7889170042 has 16 divisors (see below), whose sum is σ = 13493694312. Its totient is φ = 3426969600.

The previous prime is 7889170033. The next prime is 7889170043. The reversal of 7889170042 is 2400719887.

It is a Cunningham number, because it is equal to 88821²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 7817919561 + 71250481 = 88419^2 + 8441^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7889169974 and 7889170001.

It is not an unprimeable number, because it can be changed into a prime (7889170043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8923959 + ... + 8924842.

Almost surely, 2^7889170042 is an apocalyptic number.

7889170042 is a deficient number, since it is larger than the sum of its proper divisors (5604524270).

7889170042 is a wasteful number, since it uses less digits than its factorization.

7889170042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17848833.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 7889170042 is about 88821.0000056293. Note that the first 5 decimals coincide. The cubic root of 7889170042 is about 1990.7211885685.

The spelling of 7889170042 in words is "seven billion, eight hundred eighty-nine million, one hundred seventy thousand, forty-two".