797921280 has 520 divisors, whose sum is σ = 3163626312. Its totient is φ = 191102976.

The previous prime is 797921279. The next prime is 797921309. The reversal of 797921280 is 82129797.

It can be written as a sum of positive squares in 4 ways, for example, as 95883264 + 702038016 = 9792^2 + 26496^2 .

It is a tau number, because it is divible by the number of its divisors (520).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21565422 + ... + 21565458.

Almost surely, 2^797921280 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 797921280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1581813156).

797921280 is an abundant number, since it is smaller than the sum of its proper divisors (2365705032).

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

797921280 is a wasteful number, since it uses less digits than its factorization.

797921280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 797921280 is about 28247.5004203912. The cubic root of 797921280 is about 927.5130223419.

The spelling of 797921280 in words is "seven hundred ninety-seven million, nine hundred twenty-one thousand, two hundred eighty".