784369980 has 144 divisors (see below), whose sum is σ = 2481058944. Its totient is φ = 208008000.

The previous prime is 784369979. The next prime is 784369997. The reversal of 784369980 is 89963487.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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, 1219539 + ... + 1220181.

It is an arithmetic number, because the mean of its divisors is an integer number (17229576).

Almost surely, 2^784369980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 784369980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1240529472).

784369980 is an abundant number, since it is smaller than the sum of its proper divisors (1696688964).

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

784369980 is a wasteful number, since it uses less digits than its factorization.

784369980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 784369980 is about 28006.6060064407. The cubic root of 784369980 is about 922.2322840039.

The spelling of 784369980 in words is "seven hundred eighty-four million, three hundred sixty-nine thousand, nine hundred eighty".