74128693 has 2 divisors, whose sum is σ = 74128694. Its totient is φ = 74128692.

The previous prime is 74128679. The next prime is 74128699. The reversal of 74128693 is 39682147.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72216004 + 1912689 = 8498^2 + 1383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74128693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74128699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37064346 + 37064347.

It is an arithmetic number, because the mean of its divisors is an integer number (37064347).

Almost surely, 2^74128693 is an apocalyptic number.

It is an amenable number.

74128693 is a deficient number, since it is larger than the sum of its proper divisors (1).

74128693 is an equidigital number, since it uses as much as digits as its factorization.

74128693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 74128693 is about 8609.8021463911. The cubic root of 74128693 is about 420.0768812397.

The spelling of 74128693 in words is "seventy-four million, one hundred twenty-eight thousand, six hundred ninety-three".