7921277280 has 576 divisors, whose sum is σ = 33673812480. Its totient is φ = 1730792448.

The previous prime is 7921277261. The next prime is 7921277281. The reversal of 7921277280 is 827721297.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7921277281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4867827 + ... + 4869453.

It is an arithmetic number, because the mean of its divisors is an integer number (58461480).

Almost surely, 2^7921277280 is an apocalyptic number.

7921277280 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7921277280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16836906240).

7921277280 is an abundant number, since it is smaller than the sum of its proper divisors (25752535200).

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

7921277280 is a wasteful number, since it uses less digits than its factorization.

7921277280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688 (or 1667 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The square root of 7921277280 is about 89001.5577391767. The cubic root of 7921277280 is about 1993.4181366317.

The spelling of 7921277280 in words is "seven billion, nine hundred twenty-one million, two hundred seventy-seven thousand, two hundred eighty".