73121637 has 8 divisors (see below), whose sum is σ = 98094304. Its totient is φ = 48448368.

The previous prime is 73121617. The next prime is 73121663. The reversal of 73121637 is 73612137.

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

It is not a de Polignac number, because 73121637 - 2⁸ = 73121381 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 (73121617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74278 + ... + 75255.

It is an arithmetic number, because the mean of its divisors is an integer number (12261788).

Almost surely, 2^73121637 is an apocalyptic number.

It is an amenable number.

73121637 is a deficient number, since it is larger than the sum of its proper divisors (24972667).

73121637 is a wasteful number, since it uses less digits than its factorization.

73121637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149699.

The product of its digits is 5292, while the sum is 30.

The square root of 73121637 is about 8551.1190495747. The cubic root of 73121637 is about 418.1659197241.

The spelling of 73121637 in words is "seventy-three million, one hundred twenty-one thousand, six hundred thirty-seven".