784047420 has 144 divisors (see below), whose sum is σ = 2616082560. Its totient is φ = 188863488.

The previous prime is 784047409. The next prime is 784047421. The reversal of 784047420 is 24740487.

It is a super-2 number, since 2×784047420² = 1229460713617312800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (784047421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 106416 + ... + 113544.

It is an arithmetic number, because the mean of its divisors is an integer number (18167240).

Almost surely, 2^784047420 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 784047420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1308041280).

784047420 is an abundant number, since it is smaller than the sum of its proper divisors (1832035140).

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

784047420 is a wasteful number, since it uses less digits than its factorization.

784047420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7204 (or 7199 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

The square root of 784047420 is about 28000.8467729103. The cubic root of 784047420 is about 922.1058487587.

The spelling of 784047420 in words is "seven hundred eighty-four million, forty-seven thousand, four hundred twenty".