7844798521 has 12 divisors (see below), whose sum is σ = 9127027188. Its totient is φ = 6723048192.

The previous prime is 7844798519. The next prime is 7844798543. The reversal of 7844798521 is 1258974487.

It can be written as a sum of positive squares in 2 ways, for example, as 7828710400 + 16088121 = 88480^2 + 4011^2 .

It is not a de Polignac number, because 7844798521 - 2¹ = 7844798519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7844798501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 576225 + ... + 589681.

It is an arithmetic number, because the mean of its divisors is an integer number (760585599).

Almost surely, 2^7844798521 is an apocalyptic number.

It is an amenable number.

7844798521 is a deficient number, since it is larger than the sum of its proper divisors (1282228667).

7844798521 is a wasteful number, since it uses less digits than its factorization.

7844798521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25368 (or 25361 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 55.

The square root of 7844798521 is about 88570.8672250645. The cubic root of 7844798521 is about 1986.9819930088.

The spelling of 7844798521 in words is "seven billion, eight hundred forty-four million, seven hundred ninety-eight thousand, five hundred twenty-one".