72681005 has 4 divisors (see below), whose sum is σ = 87217212. Its totient is φ = 58144800.

The previous prime is 72680999. The next prime is 72681013. The reversal of 72681005 is 50018627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14280841 + 58400164 = 3779^2 + 7642^2 .

It is not a de Polignac number, because 72681005 - 2¹² = 72676909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7268096 + ... + 7268105.

It is an arithmetic number, because the mean of its divisors is an integer number (21804303).

Almost surely, 2^72681005 is an apocalyptic number.

It is an amenable number.

72681005 is a deficient number, since it is larger than the sum of its proper divisors (14536207).

72681005 is a wasteful number, since it uses less digits than its factorization.

72681005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14536206.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 72681005 is about 8525.3155366825. The cubic root of 72681005 is about 417.3242689739.

The spelling of 72681005 in words is "seventy-two million, six hundred eighty-one thousand, five".