780099320 has 128 divisors (see below), whose sum is σ = 2356784640. Its totient is φ = 224432640.

The previous prime is 780099319. The next prime is 780099323. The reversal of 780099320 is 23990087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780099323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30299 + ... + 49781.

It is an arithmetic number, because the mean of its divisors is an integer number (18412380).

Almost surely, 2^780099320 is an apocalyptic number.

780099320 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 780099320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1178392320).

780099320 is an abundant number, since it is smaller than the sum of its proper divisors (1576685320).

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

780099320 is a wasteful number, since it uses less digits than its factorization.

780099320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19525 (or 19521 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 780099320 is about 27930.2581441705. The cubic root of 780099320 is about 920.5554774009. Note that the first 3 decimals are identical.

The spelling of 780099320 in words is "seven hundred eighty million, ninety-nine thousand, three hundred twenty".