780220321 has 8 divisors (see below), whose sum is σ = 854602920. Its totient is φ = 709003008.

The previous prime is 780220303. The next prime is 780220327. The reversal of 780220321 is 123022087.

It can be written as a sum of positive squares in 4 ways, for example, as 168350625 + 611869696 = 12975^2 + 24736^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 780220321 - 2⁵ = 780220289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (780220327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 790806 + ... + 791791.

It is an arithmetic number, because the mean of its divisors is an integer number (106825365).

Almost surely, 2^780220321 is an apocalyptic number.

It is an amenable number.

780220321 is a deficient number, since it is larger than the sum of its proper divisors (74382599).

780220321 is a wasteful number, since it uses less digits than its factorization.

780220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582643.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 780220321 is about 27932.4241876712. The cubic root of 780220321 is about 920.6030706461.

The spelling of 780220321 in words is "seven hundred eighty million, two hundred twenty thousand, three hundred twenty-one".