73681639 has 8 divisors (see below), whose sum is σ = 77728640. Its totient is φ = 69651576.

The previous prime is 73681609. The next prime is 73681649. The reversal of 73681639 is 93618637.

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

It is a cyclic number.

It is not a de Polignac number, because 73681639 - 2⁷ = 73681511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73681595 and 73681604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73681609) 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 7 ways as a sum of consecutive naturals, for example, 5272 + ... + 13234.

It is an arithmetic number, because the mean of its divisors is an integer number (9716080).

Almost surely, 2^73681639 is an apocalyptic number.

73681639 is a deficient number, since it is larger than the sum of its proper divisors (4047001).

73681639 is a wasteful number, since it uses less digits than its factorization.

73681639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8469.

The product of its digits is 163296, while the sum is 43.

The square root of 73681639 is about 8583.8009646077. The cubic root of 73681639 is about 419.2307138810.

The spelling of 73681639 in words is "seventy-three million, six hundred eighty-one thousand, six hundred thirty-nine".