43857728261 has 16 divisors (see below), whose sum is σ = 44728320000. Its totient is φ = 42997188528.

The previous prime is 43857728219. The next prime is 43857728263. The reversal of 43857728261 is 16282775834.

43857728261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43857728261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43857728263) 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, 6524060 + ... + 6530778.

It is an arithmetic number, because the mean of its divisors is an integer number (2795520000).

Almost surely, 2^43857728261 is an apocalyptic number.

It is an amenable number.

43857728261 is a deficient number, since it is larger than the sum of its proper divisors (870591739).

43857728261 is a wasteful number, since it uses less digits than its factorization.

43857728261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7448.

The product of its digits is 4515840, while the sum is 53.

The spelling of 43857728261 in words is "forty-three billion, eight hundred fifty-seven million, seven hundred twenty-eight thousand, two hundred sixty-one".