1827721660 has 24 divisors (see below), whose sum is σ = 3843863856. Its totient is φ = 730012800.

The previous prime is 1827721639. The next prime is 1827721661. The reversal of 1827721660 is 661277281.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1827721661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53241 + ... + 80560.

It is an arithmetic number, because the mean of its divisors is an integer number (160160994).

Almost surely, 2^1827721660 is an apocalyptic number.

1827721660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1827721660 is an abundant number, since it is smaller than the sum of its proper divisors (2016142196).

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

1827721660 is a wasteful number, since it uses less digits than its factorization.

1827721660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134493 (or 134491 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 1827721660 is about 42751.8614799403. The cubic root of 1827721660 is about 1222.6533802199.

The spelling of 1827721660 in words is "one billion, eight hundred twenty-seven million, seven hundred twenty-one thousand, six hundred sixty".