1781338272 has 96 divisors (see below), whose sum is σ = 5368430592. Its totient is φ = 506628864.

The previous prime is 1781338271. The next prime is 1781338283. The reversal of 1781338272 is 2728331871.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1781338271) 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, 143913 + ... + 155799.

It is an arithmetic number, because the mean of its divisors is an integer number (55921152).

Almost surely, 2^1781338272 is an apocalyptic number.

1781338272 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 1781338272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2684215296).

1781338272 is an abundant number, since it is smaller than the sum of its proper divisors (3587092320).

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

1781338272 is a wasteful number, since it uses less digits than its factorization.

1781338272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12130 (or 12122 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 1781338272 is about 42205.9032837825. The cubic root of 1781338272 is about 1212.2219201733.

The spelling of 1781338272 in words is "one billion, seven hundred eighty-one million, three hundred thirty-eight thousand, two hundred seventy-two".