1816268720 has 40 divisors (see below), whose sum is σ = 4826086944. Its totient is φ = 622720512.

The previous prime is 1816268711. The next prime is 1816268723. The reversal of 1816268720 is 278626181.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1816268723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1621109 + ... + 1622228.

Almost surely, 2^1816268720 is an apocalyptic number.

1816268720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1816268720 is an abundant number, since it is smaller than the sum of its proper divisors (3009818224).

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

1816268720 is a wasteful number, since it uses less digits than its factorization.

1816268720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243357 (or 3243351 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 1816268720 is about 42617.7043023202. The cubic root of 1816268720 is about 1220.0942147074.

The spelling of 1816268720 in words is "one billion, eight hundred sixteen million, two hundred sixty-eight thousand, seven hundred twenty".