321280780 has 24 divisors (see below), whose sum is σ = 675026352. Its totient is φ = 128448192.

The previous prime is 321280741. The next prime is 321280789. The reversal of 321280780 is 87082123.

It is not an unprimeable number, because it can be changed into a prime (321280789) 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 7 ways as a sum of consecutive naturals, for example, 78054 + ... + 82066.

It is an arithmetic number, because the mean of its divisors is an integer number (28126098).

Almost surely, 2^321280780 is an apocalyptic number.

It is an amenable number.

321280780 is an abundant number, since it is smaller than the sum of its proper divisors (353745572).

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

321280780 is a wasteful number, since it uses less digits than its factorization.

321280780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8025 (or 8023 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 321280780 is about 17924.3069601031. The cubic root of 321280780 is about 684.9017068190.

The spelling of 321280780 in words is "three hundred twenty-one million, two hundred eighty thousand, seven hundred eighty".