74403661 has 4 divisors (see below), whose sum is σ = 75664800. Its totient is φ = 73142524.

The previous prime is 74403653. The next prime is 74403671. The reversal of 74403661 is 16630447.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16630447 = 2203 ⋅7549.

It is a cyclic number.

It is not a de Polignac number, because 74403661 - 2³ = 74403653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74403671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630481 + ... + 630598.

It is an arithmetic number, because the mean of its divisors is an integer number (18916200).

Almost surely, 2^74403661 is an apocalyptic number.

It is an amenable number.

74403661 is a deficient number, since it is larger than the sum of its proper divisors (1261139).

74403661 is a wasteful number, since it uses less digits than its factorization.

74403661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261138.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 74403661 is about 8625.7556770407. The cubic root of 74403661 is about 420.5956420144.

The spelling of 74403661 in words is "seventy-four million, four hundred three thousand, six hundred sixty-one".