2151544720 has 80 divisors (see below), whose sum is σ = 5394654720. Its totient is φ = 793308672.

The previous prime is 2151544693. The next prime is 2151544727. The reversal of 2151544720 is 274451512.

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

It is not an unprimeable number, because it can be changed into a prime (2151544727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1379301 + ... + 1380859.

It is an arithmetic number, because the mean of its divisors is an integer number (67433184).

Almost surely, 2^2151544720 is an apocalyptic number.

2151544720 is a gapful number since it is divisible by the number (20) 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 2151544720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2697327360).

2151544720 is an abundant number, since it is smaller than the sum of its proper divisors (3243110000).

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

2151544720 is a wasteful number, since it uses less digits than its factorization.

2151544720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2912 (or 2906 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 2151544720 is about 46384.7466307621. The cubic root of 2151544720 is about 1290.9719094304.

The spelling of 2151544720 in words is "two billion, one hundred fifty-one million, five hundred forty-four thousand, seven hundred twenty".