7899258755844 has 81 divisors (see below), whose sum is σ = 20050910729941. Its totient is φ = 2622141923520.

The previous prime is 7899258755833. The next prime is 7899258755863. The reversal of 7899258755844 is 4485578529987.

It is a happy number.

The square root of 7899258755844 is 2810562.

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

7899258755844 is a `hidden beast` number, since 7 + 8 + 9 + 9 + 2 + 58 + 7 + 558 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5338234653444 + 2561024102400 = 2310462^2 + 1600320^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4738606699 + ... + 4738608365.

Almost surely, 2^{7899258755844} is an apocalyptic number.

7899258755844 is the 2810562-nd square number.

It is an amenable number.

7899258755844 is an abundant number, since it is smaller than the sum of its proper divisors (12151651974097).

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

7899258755844 is an equidigital number, since it uses as much as digits as its factorization.

7899258755844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906 (or 1953 counting only the distinct ones).

The product of its digits is 8128512000, while the sum is 81.

Multiplying 7899258755844 by its sum of digits (81), we get a square (639839959223364 = 25295058²).

The spelling of 7899258755844 in words is "seven trillion, eight hundred ninety-nine billion, two hundred fifty-eight million, seven hundred fifty-five thousand, eight hundred forty-four".