7921798505928 has 256 divisors, whose sum is σ = 22786091059200. Its totient is φ = 2547417600000.

The previous prime is 7921798505921. The next prime is 7921798505939. The reversal of 7921798505928 is 8295058971297.

7921798505928 is a `hidden beast` number, since 7 + 9 + 2 + 1 + 7 + 98 + 505 + 9 + 28 = 666.

It is a super-2 number, since 2×7921798505928² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (7921798505921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4398554628 + ... + 4398556428.

It is an arithmetic number, because the mean of its divisors is an integer number (89008168200).

Almost surely, 2^{7921798505928} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7921798505928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11393045529600).

7921798505928 is an abundant number, since it is smaller than the sum of its proper divisors (14864292553272).

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

7921798505928 is a wasteful number, since it uses less digits than its factorization.

7921798505928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3541 (or 3531 counting only the distinct ones).

The product of its (nonzero) digits is 228614400, while the sum is 72.

The spelling of 7921798505928 in words is "seven trillion, nine hundred twenty-one billion, seven hundred ninety-eight million, five hundred five thousand, nine hundred twenty-eight".