75128399 has 2 divisors, whose sum is σ = 75128400. Its totient is φ = 75128398.

The previous prime is 75128387. The next prime is 75128411. The reversal of 75128399 is 99382157.

It is a balanced prime because it is at equal distance from previous prime (75128387) and next prime (75128411).

It is a cyclic number.

It is not a de Polignac number, because 75128399 - 2¹² = 75124303 is a prime.

It is a super-3 number, since 3×75128399³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75128309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37564199 + 37564200.

It is an arithmetic number, because the mean of its divisors is an integer number (37564200).

Almost surely, 2^75128399 is an apocalyptic number.

75128399 is a deficient number, since it is larger than the sum of its proper divisors (1).

75128399 is an equidigital number, since it uses as much as digits as its factorization.

75128399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 75128399 is about 8667.6639874882. The cubic root of 75128399 is about 421.9568530267.

The spelling of 75128399 in words is "seventy-five million, one hundred twenty-eight thousand, three hundred ninety-nine".