75628109 has 2 divisors, whose sum is σ = 75628110. Its totient is φ = 75628108.

The previous prime is 75628061. The next prime is 75628129. The reversal of 75628109 is 90182657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69973225 + 5654884 = 8365^2 + 2378^2 .

It is a cyclic number.

It is not a de Polignac number, because 75628109 - 2¹⁶ = 75562573 is a prime.

It is a super-2 number, since 2×75628109² = 11439221741831762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75628129) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37814054 + 37814055.

It is an arithmetic number, because the mean of its divisors is an integer number (37814055).

Almost surely, 2^75628109 is an apocalyptic number.

It is an amenable number.

75628109 is a deficient number, since it is larger than the sum of its proper divisors (1).

75628109 is an equidigital number, since it uses as much as digits as its factorization.

75628109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 75628109 is about 8696.4423185576. The cubic root of 75628109 is about 422.8903228588.

The spelling of 75628109 in words is "seventy-five million, six hundred twenty-eight thousand, one hundred nine".