2251043720 has 16 divisors (see below), whose sum is σ = 5064848460. Its totient is φ = 900417472.

The previous prime is 2251043681. The next prime is 2251043723. The reversal of 2251043720 is 273401522.

It can be written as a sum of positive squares in 2 ways, for example, as 2086845124 + 164198596 = 45682^2 + 12814^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2251043720.

It is not an unprimeable number, because it can be changed into a prime (2251043723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28138007 + ... + 28138086.

Almost surely, 2^2251043720 is an apocalyptic number.

2251043720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2251043720 is an abundant number, since it is smaller than the sum of its proper divisors (2813804740).

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

2251043720 is a wasteful number, since it uses less digits than its factorization.

2251043720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56276104 (or 56276100 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 2251043720 is about 47445.1654017562. The cubic root of 2251043720 is about 1310.5732820946.

The spelling of 2251043720 in words is "two billion, two hundred fifty-one million, forty-three thousand, seven hundred twenty".