2120720640 has 72 divisors (see below), whose sum is σ = 6773063808. Its totient is φ = 565524480.

The previous prime is 2120720629. The next prime is 2120720659. The reversal of 2120720640 is 460270212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2120720640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272296 + ... + 279975.

Almost surely, 2^2120720640 is an apocalyptic number.

2120720640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2120720640 is an abundant number, since it is smaller than the sum of its proper divisors (4652343168).

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

2120720640 is an equidigital number, since it uses as much as digits as its factorization.

2120720640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552295 (or 552281 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 2120720640 is about 46051.2827182914. The cubic root of 2120720640 is about 1284.7772004926. Note that the first 3 decimals are identical.

Adding to 2120720640 its reverse (460270212), we get a palindrome (2580990852).

The spelling of 2120720640 in words is "two billion, one hundred twenty million, seven hundred twenty thousand, six hundred forty".