75282721 has 2 divisors, whose sum is σ = 75282722. Its totient is φ = 75282720.

The previous prime is 75282709. The next prime is 75282751. The reversal of 75282721 is 12728257.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51624225 + 23658496 = 7185^2 + 4864^2 .

It is a cyclic number.

It is not a de Polignac number, because 75282721 - 2⁵ = 75282689 is a prime.

It is equal to p_4409944 and since 75282721 and 4409944 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (75282751) 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 as a sum of consecutive naturals, namely, 37641360 + 37641361.

It is an arithmetic number, because the mean of its divisors is an integer number (37641361).

Almost surely, 2^75282721 is an apocalyptic number.

It is an amenable number.

75282721 is a deficient number, since it is larger than the sum of its proper divisors (1).

75282721 is an equidigital number, since it uses as much as digits as its factorization.

75282721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 34.

The square root of 75282721 is about 8676.5615885557. The cubic root of 75282721 is about 422.2455707028.

The spelling of 75282721 in words is "seventy-five million, two hundred eighty-two thousand, seven hundred twenty-one".