74081561 has 8 divisors (see below), whose sum is σ = 75995040. Its totient is φ = 72176832.

The previous prime is 74081503. The next prime is 74081569. The reversal of 74081561 is 16518047.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74081561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74081569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17105 + ... + 20993.

It is an arithmetic number, because the mean of its divisors is an integer number (9499380).

Almost surely, 2^74081561 is an apocalyptic number.

It is an amenable number.

74081561 is a deficient number, since it is larger than the sum of its proper divisors (1913479).

74081561 is a wasteful number, since it uses less digits than its factorization.

74081561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 74081561 is about 8607.0645983401. The cubic root of 74081561 is about 419.9878322250.

The spelling of 74081561 in words is "seventy-four million, eighty-one thousand, five hundred sixty-one".