75645397 has 2 divisors, whose sum is σ = 75645398. Its totient is φ = 75645396.

The previous prime is 75645377. The next prime is 75645431. The reversal of 75645397 is 79354657.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75325041 + 320356 = 8679^2 + 566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75645397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75645347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37822698 + 37822699.

It is an arithmetic number, because the mean of its divisors is an integer number (37822699).

Almost surely, 2^75645397 is an apocalyptic number.

It is an amenable number.

75645397 is a deficient number, since it is larger than the sum of its proper divisors (1).

75645397 is an equidigital number, since it uses as much as digits as its factorization.

75645397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 46.

The square root of 75645397 is about 8697.4362314420. The cubic root of 75645397 is about 422.9225435547.

The spelling of 75645397 in words is "seventy-five million, six hundred forty-five thousand, three hundred ninety-seven".