7869897792 has 140 divisors (see below), whose sum is σ = 23407321740. Its totient is φ = 2614477824.

The previous prime is 7869897779. The next prime is 7869897803. The reversal of 7869897792 is 2977989687.

It can be written as a sum of positive squares in 2 ways, for example, as 491774976 + 7378122816 = 22176^2 + 85896^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 7869897792.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1640934 + ... + 1645722.

Almost surely, 2^7869897792 is an apocalyptic number.

7869897792 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7869897792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11703660870).

7869897792 is an abundant number, since it is smaller than the sum of its proper divisors (15537423948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7869897792 is a wasteful number, since it uses less digits than its factorization.

7869897792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5130 (or 5111 counting only the distinct ones).

The product of its digits is 192036096, while the sum is 72.

The square root of 7869897792 is about 88712.4444032516. Note that the first 4 decimals coincide. The cubic root of 7869897792 is about 1989.0988396383.

The spelling of 7869897792 in words is "seven billion, eight hundred sixty-nine million, eight hundred ninety-seven thousand, seven hundred ninety-two".