75721941 has 6 divisors (see below), whose sum is σ = 109376150. Its totient is φ = 50481288.

The previous prime is 75721907. The next prime is 75721963. The reversal of 75721941 is 14912757.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 75325041 + 396900 = 8679^2 + 630^2 .

It is not a de Polignac number, because 75721941 - 2¹⁰ = 75720917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75721896 and 75721905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75721901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4206766 + ... + 4206783.

Almost surely, 2^75721941 is an apocalyptic number.

It is an amenable number.

75721941 is a deficient number, since it is larger than the sum of its proper divisors (33654209).

75721941 is a wasteful number, since it uses less digits than its factorization.

75721941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8413555 (or 8413552 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 75721941 is about 8701.8354960319. The cubic root of 75721941 is about 423.0651443019.

The spelling of 75721941 in words is "seventy-five million, seven hundred twenty-one thousand, nine hundred forty-one".