79821280 has 288 divisors, whose sum is σ = 257402880. Its totient is φ = 22809600.

The previous prime is 79821257. The next prime is 79821283. The reversal of 79821280 is 8212897.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79821283) 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 47 ways as a sum of consecutive naturals, for example, 2574865 + ... + 2574895.

It is an arithmetic number, because the mean of its divisors is an integer number (893760).

Almost surely, 2^79821280 is an apocalyptic number.

79821280 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 79821280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128701440).

79821280 is an abundant number, since it is smaller than the sum of its proper divisors (177581600).

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

79821280 is a wasteful number, since it uses less digits than its factorization.

79821280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 79821280 is about 8934.2755721995. The cubic root of 79821280 is about 430.5658316305.

The spelling of 79821280 in words is "seventy-nine million, eight hundred twenty-one thousand, two hundred eighty".