3443128721 has 8 divisors (see below), whose sum is σ = 3547716480. Its totient is φ = 3339147888.

The previous prime is 3443128691. The next prime is 3443128747. The reversal of 3443128721 is 1278213443.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3443128721 - 2⁶ = 3443128657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3443128751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140201 + ... + 162918.

It is an arithmetic number, because the mean of its divisors is an integer number (443464560).

Almost surely, 2^3443128721 is an apocalyptic number.

It is an amenable number.

3443128721 is a deficient number, since it is larger than the sum of its proper divisors (104587759).

3443128721 is a wasteful number, since it uses less digits than its factorization.

3443128721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303463.

The product of its digits is 32256, while the sum is 35.

The square root of 3443128721 is about 58678.1792577104. The cubic root of 3443128721 is about 1510.0259810158.

The spelling of 3443128721 in words is "three billion, four hundred forty-three million, one hundred twenty-eight thousand, seven hundred twenty-one".