75428581 has 2 divisors, whose sum is σ = 75428582. Its totient is φ = 75428580.

The previous prime is 75428557. The next prime is 75428597. The reversal of 75428581 is 18582457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50836900 + 24591681 = 7130^2 + 4959^2 .

It is an emirp because it is prime and its reverse (18582457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75428581 - 2¹⁹ = 74904293 is a prime.

It is a super-2 number, since 2×75428581² = 11378941663347122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75428531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37714290 + 37714291.

It is an arithmetic number, because the mean of its divisors is an integer number (37714291).

Almost surely, 2^75428581 is an apocalyptic number.

It is an amenable number.

75428581 is a deficient number, since it is larger than the sum of its proper divisors (1).

75428581 is an equidigital number, since it uses as much as digits as its factorization.

75428581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 89600, while the sum is 40.

The square root of 75428581 is about 8684.9629245035. The cubic root of 75428581 is about 422.5180945298.

The spelling of 75428581 in words is "seventy-five million, four hundred twenty-eight thousand, five hundred eighty-one".