7899476641 has 9 divisors (see below), whose sum is σ = 9189910899. Its totient is φ = 6770446704.

The previous prime is 7899476639. The next prime is 7899476647. The reversal of 7899476641 is 1466749987.

The square root of 7899476641 is 88879.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1611621025 + 6287855616 = 40145^2 + 79296^2 .

It is not a de Polignac number, because 7899476641 - 2¹ = 7899476639 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 7899476641.

It is not an unprimeable number, because it can be changed into a prime (7899476647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 615805 + ... + 628501.

It is an arithmetic number, because the mean of its divisors is an integer number (1021101211).

Almost surely, 2^7899476641 is an apocalyptic number.

7899476641 is the 88879-th square number.

7899476641 is the 44440-th centered octagonal number.

It is an amenable number.

7899476641 is a deficient number, since it is larger than the sum of its proper divisors (1290434258).

7899476641 is an frugal number, since it uses more digits than its factorization.

7899476641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25408 (or 12704 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 61.

The cubic root of 7899476641 is about 1991.5877197965.

The spelling of 7899476641 in words is "seven billion, eight hundred ninety-nine million, four hundred seventy-six thousand, six hundred forty-one".