784809090 has 48 divisors (see below), whose sum is σ = 2197468728. Its totient is φ = 193183488.

The previous prime is 784809089. The next prime is 784809119. The reversal of 784809090 is 90908487.

784809090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 728514081 + 56295009 = 26991^2 + 7503^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 334219 + ... + 336558.

Almost surely, 2^784809090 is an apocalyptic number.

784809090 is an abundant number, since it is smaller than the sum of its proper divisors (1412659638).

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

784809090 is a wasteful number, since it uses less digits than its factorization.

784809090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670803 (or 670800 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 784809090 is about 28014.4443100341. Note that the first 3 decimals coincide. The cubic root of 784809090 is about 922.4043481585.

The spelling of 784809090 in words is "seven hundred eighty-four million, eight hundred nine thousand, ninety".