7798479481 has 9 divisors (see below), whose sum is σ = 8445750669. Its totient is φ = 7197536736.

The previous prime is 7798479473. The next prime is 7798479511. The reversal of 7798479481 is 1849748977.

The square root of 7798479481 is 88309.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4390255081 + 3408224400 = 66259^2 + 58380^2 .

It is not a de Polignac number, because 7798479481 - 2³ = 7798479473 is a prime.

It is a super-2 number, since 2×7798479481² (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 (7798479431) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1144621 + ... + 1151413.

It is an arithmetic number, because the mean of its divisors is an integer number (938416741).

Almost surely, 2^7798479481 is an apocalyptic number.

7798479481 is the 88309-th square number.

7798479481 is the 44155-th centered octagonal number.

It is an amenable number.

7798479481 is a deficient number, since it is larger than the sum of its proper divisors (647271188).

7798479481 is an frugal number, since it uses more digits than its factorization.

7798479481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13612 (or 6806 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 64.

The cubic root of 7798479481 is about 1983.0636075604.

Multiplying 7798479481 by its sum of digits (64), we get a square (499102686784 = 706472²).

The spelling of 7798479481 in words is "seven billion, seven hundred ninety-eight million, four hundred seventy-nine thousand, four hundred eighty-one".