780221064 has 64 divisors (see below), whose sum is σ = 2257459200. Its totient is φ = 220094784.

The previous prime is 780221063. The next prime is 780221087. The reversal of 780221064 is 460122087.

It is not an unprimeable number, because it can be changed into a prime (780221063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16122 + ... + 42665.

It is an arithmetic number, because the mean of its divisors is an integer number (35272800).

Almost surely, 2^780221064 is an apocalyptic number.

It is an amenable number.

780221064 is an abundant number, since it is smaller than the sum of its proper divisors (1477238136).

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

780221064 is a wasteful number, since it uses less digits than its factorization.

780221064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58882 (or 58878 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 780221064 is about 27932.4374876236. The cubic root of 780221064 is about 920.6033628746.

The spelling of 780221064 in words is "seven hundred eighty million, two hundred twenty-one thousand, sixty-four".