7897825861 has 4 divisors (see below), whose sum is σ = 8111280652. Its totient is φ = 7684371072.

The previous prime is 7897825823. The next prime is 7897825877. The reversal of 7897825861 is 1685287987.

7897825861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6151421761 + 1746404100 = 78431^2 + 41790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7897825861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7897825861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7897825801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106727340 + ... + 106727413.

It is an arithmetic number, because the mean of its divisors is an integer number (2027820163).

Almost surely, 2^7897825861 is an apocalyptic number.

It is an amenable number.

7897825861 is a deficient number, since it is larger than the sum of its proper divisors (213454791).

7897825861 is a wasteful number, since it uses less digits than its factorization.

7897825861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213454790.

The product of its digits is 13547520, while the sum is 61.

The square root of 7897825861 is about 88869.7128441406. The cubic root of 7897825861 is about 1991.4489805540.

The spelling of 7897825861 in words is "seven billion, eight hundred ninety-seven million, eight hundred twenty-five thousand, eight hundred sixty-one".