7281391098852 has 72 divisors (see below), whose sum is σ = 19823124634040. Its totient is φ = 2240251706880.

The previous prime is 7281391098757. The next prime is 7281391098857. The reversal of 7281391098852 is 2588901931827.

7281391098852 is a `hidden beast` number, since 7 + 2 + 81 + 391 + 0 + 98 + 85 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 146209875876 + 7135181222976 = 382374^2 + 2671176^2 .

It is a super-2 number, since 2×7281391098852² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7281391098852.

It is not an unprimeable number, because it can be changed into a prime (7281391098857) 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, 5403774 + ... + 6615402.

Almost surely, 2^{7281391098852} is an apocalyptic number.

It is an amenable number.

7281391098852 is an abundant number, since it is smaller than the sum of its proper divisors (12541733535188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7281391098852 is a wasteful number, since it uses less digits than its factorization.

7281391098852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224493 (or 1224488 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 63.

The spelling of 7281391098852 in words is "seven trillion, two hundred eighty-one billion, three hundred ninety-one million, ninety-eight thousand, eight hundred fifty-two".