1780640832 has 112 divisors (see below), whose sum is σ = 4933736640. Its totient is φ = 566028288.

The previous prime is 1780640819. The next prime is 1780640833. The reversal of 1780640832 is 2380460871.

It is not an unprimeable number, because it can be changed into a prime (1780640833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460218 + ... + 464070.

It is an arithmetic number, because the mean of its divisors is an integer number (44051220).

Almost surely, 2^1780640832 is an apocalyptic number.

1780640832 is a gapful number since it is divisible by the number (12) 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 1780640832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2466868320).

1780640832 is an abundant number, since it is smaller than the sum of its proper divisors (3153095808).

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

1780640832 is a wasteful number, since it uses less digits than its factorization.

1780640832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3980 (or 3970 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 1780640832 is about 42197.6401235898. The cubic root of 1780640832 is about 1212.0636941115.

The spelling of 1780640832 in words is "one billion, seven hundred eighty million, six hundred forty thousand, eight hundred thirty-two".