74388661 has 2 divisors, whose sum is σ = 74388662. Its totient is φ = 74388660.

The previous prime is 74388653. The next prime is 74388731. The reversal of 74388661 is 16688347.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45562500 + 28826161 = 6750^2 + 5369^2 .

It is a cyclic number.

It is not a de Polignac number, because 74388661 - 2³ = 74388653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74388361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37194330 + 37194331.

It is an arithmetic number, because the mean of its divisors is an integer number (37194331).

Almost surely, 2^74388661 is an apocalyptic number.

It is an amenable number.

74388661 is a deficient number, since it is larger than the sum of its proper divisors (1).

74388661 is an equidigital number, since it uses as much as digits as its factorization.

74388661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 74388661 is about 8624.8861441760. The cubic root of 74388661 is about 420.5673756694.

The spelling of 74388661 in words is "seventy-four million, three hundred eighty-eight thousand, six hundred sixty-one".