1788272640 has 840 divisors, whose sum is σ = 8135535672. Its totient is φ = 371589120.

The previous prime is 1788272597. The next prime is 1788272663. The reversal of 1788272640 is 462728871.

It is a tau number, because it is divible by the number of its divisors (840).

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

It is a congruent number.

It is an unprimeable number.

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 59 ways as a sum of consecutive naturals, for example, 162570235 + ... + 162570245.

Almost surely, 2^1788272640 is an apocalyptic number.

1788272640 is a gapful number since it is divisible by the number (10) 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 1788272640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4067767836).

1788272640 is an abundant number, since it is smaller than the sum of its proper divisors (6347263032).

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

1788272640 is an equidigital number, since it uses as much as digits as its factorization.

1788272640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The square root of 1788272640 is about 42287.9727582205. The cubic root of 1788272640 is about 1213.7928568443.

The spelling of 1788272640 in words is "one billion, seven hundred eighty-eight million, two hundred seventy-two thousand, six hundred forty".