75628309 has 2 divisors, whose sum is σ = 75628310. Its totient is φ = 75628308.

The previous prime is 75628307. The next prime is 75628331. The reversal of 75628309 is 90382657.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64883025 + 10745284 = 8055^2 + 3278^2 .

It is an emirp because it is prime and its reverse (90382657) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75628309 - 2¹ = 75628307 is a prime.

It is a super-2 number, since 2×75628309² = 11439282244398962, which contains 22 as substring.

Together with 75628307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75628307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37814154 + 37814155.

It is an arithmetic number, because the mean of its divisors is an integer number (37814155).

Almost surely, 2^75628309 is an apocalyptic number.

It is an amenable number.

75628309 is a deficient number, since it is larger than the sum of its proper divisors (1).

75628309 is an equidigital number, since it uses as much as digits as its factorization.

75628309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 75628309 is about 8696.4538175052. The cubic root of 75628309 is about 422.8906956391.

The spelling of 75628309 in words is "seventy-five million, six hundred twenty-eight thousand, three hundred nine".