74688661 has 4 divisors (see below), whose sum is σ = 74784352. Its totient is φ = 74592972.

The previous prime is 74688643. The next prime is 74688683. The reversal of 74688661 is 16688647.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 74688661 - 2⁹ = 74688149 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 (74688161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46665 + ... + 48238.

It is an arithmetic number, because the mean of its divisors is an integer number (18696088).

Almost surely, 2^74688661 is an apocalyptic number.

It is an amenable number.

74688661 is a deficient number, since it is larger than the sum of its proper divisors (95691).

74688661 is an equidigital number, since it uses as much as digits as its factorization.

74688661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95690.

The product of its digits is 387072, while the sum is 46.

The square root of 74688661 is about 8642.2601789115. The cubic root of 74688661 is about 421.1319822485.

It can be divided in two parts, 7468 and 8661, that added together give a square (16129 = 127²).

The spelling of 74688661 in words is "seventy-four million, six hundred eighty-eight thousand, six hundred sixty-one".