73972581 has 8 divisors (see below), whose sum is σ = 99147264. Its totient is φ = 49056480.

The previous prime is 73972543. The next prime is 73972589. The reversal of 73972581 is 18527937.

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

It is not a de Polignac number, because 73972581 - 2⁶ = 73972517 is a prime.

It is a super-2 number, since 2×73972581² = 10943885479603122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73972589) 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, 63976 + ... + 65121.

It is an arithmetic number, because the mean of its divisors is an integer number (12393408).

Almost surely, 2^73972581 is an apocalyptic number.

It is an amenable number.

73972581 is a deficient number, since it is larger than the sum of its proper divisors (25174683).

73972581 is a wasteful number, since it uses less digits than its factorization.

73972581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129291.

The product of its digits is 105840, while the sum is 42.

The square root of 73972581 is about 8600.7314223850. The cubic root of 73972581 is about 419.7817857377.

The spelling of 73972581 in words is "seventy-three million, nine hundred seventy-two thousand, five hundred eighty-one".