7865078641 has 24 divisors (see below), whose sum is σ = 9409580520. Its totient is φ = 6550129152.

The previous prime is 7865078587. The next prime is 7865078647. The reversal of 7865078641 is 1468705687.

It can be written as a sum of positive squares in 4 ways, for example, as 5233799025 + 2631279616 = 72345^2 + 51296^2 .

It is not a de Polignac number, because 7865078641 - 2⁷ = 7865078513 is a prime.

It is a super-2 number, since 2×7865078641² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7865078647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1500361 + ... + 1505593.

It is an arithmetic number, because the mean of its divisors is an integer number (392065855).

Almost surely, 2^7865078641 is an apocalyptic number.

It is an amenable number.

7865078641 is a deficient number, since it is larger than the sum of its proper divisors (1544501879).

7865078641 is a wasteful number, since it uses less digits than its factorization.

7865078641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6113 (or 6106 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 52.

The square root of 7865078641 is about 88685.2786036104. The cubic root of 7865078641 is about 1988.6927469035.

The spelling of 7865078641 in words is "seven billion, eight hundred sixty-five million, seventy-eight thousand, six hundred forty-one".