2135644720 has 80 divisors (see below), whose sum is σ = 5735445408. Its totient is φ = 730910720.

The previous prime is 2135644663. The next prime is 2135644723. The reversal of 2135644720 is 274465312.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (2135644723) 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 15 ways as a sum of consecutive naturals, for example, 56419 + ... + 86338.

Almost surely, 2^2135644720 is an apocalyptic number.

2135644720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2135644720 is an abundant number, since it is smaller than the sum of its proper divisors (3599800688).

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

2135644720 is a wasteful number, since it uses less digits than its factorization.

2135644720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142798 (or 142792 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 2135644720 is about 46213.0362560176. The cubic root of 2135644720 is about 1287.7839323526.

The spelling of 2135644720 in words is "two billion, one hundred thirty-five million, six hundred forty-four thousand, seven hundred twenty".