7891906642 has 16 divisors (see below), whose sum is σ = 11923873920. Its totient is φ = 3917342368.

The previous prime is 7891906577. The next prime is 7891906643. The reversal of 7891906642 is 2466091987.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 7891906642.

It is not an unprimeable number, because it can be changed into a prime (7891906643) 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, 255603 + ... + 284809.

It is an arithmetic number, because the mean of its divisors is an integer number (745242120).

Almost surely, 2^7891906642 is an apocalyptic number.

7891906642 is a deficient number, since it is larger than the sum of its proper divisors (4031967278).

7891906642 is a wasteful number, since it uses less digits than its factorization.

7891906642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30185.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 7891906642 is about 88836.4038106001. The cubic root of 7891906642 is about 1990.9513428088.

The spelling of 7891906642 in words is "seven billion, eight hundred ninety-one million, nine hundred six thousand, six hundred forty-two".