74061581 has 8 divisors (see below), whose sum is σ = 81042528. Its totient is φ = 67122000.

The previous prime is 74061569. The next prime is 74061593. The reversal of 74061581 is 18516047.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (74061569) and next prime (74061593).

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

It is not a de Polignac number, because 74061581 - 2⁶ = 74061517 is a prime.

It is a super-2 number, since 2×74061581² = 10970235560439122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74061521) 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, 6530 + ... + 13811.

It is an arithmetic number, because the mean of its divisors is an integer number (10130316).

Almost surely, 2^74061581 is an apocalyptic number.

It is an amenable number.

74061581 is a deficient number, since it is larger than the sum of its proper divisors (6980947).

74061581 is a wasteful number, since it uses less digits than its factorization.

74061581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20683.

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

The square root of 74061581 is about 8605.9038456167. The cubic root of 74061581 is about 419.9500715403.

The spelling of 74061581 in words is "seventy-four million, sixty-one thousand, five hundred eighty-one".