72644105 has 4 divisors (see below), whose sum is σ = 87172932. Its totient is φ = 58115280.

The previous prime is 72644083. The next prime is 72644123. The reversal of 72644105 is 50144627.

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 17572864 + 55071241 = 4192^2 + 7421^2 .

It is not a de Polignac number, because 72644105 - 2¹⁸ = 72381961 is a prime.

It is a Duffinian 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, 7264406 + ... + 7264415.

It is an arithmetic number, because the mean of its divisors is an integer number (21793233).

Almost surely, 2^72644105 is an apocalyptic number.

It is an amenable number.

72644105 is a deficient number, since it is larger than the sum of its proper divisors (14528827).

72644105 is a wasteful number, since it uses less digits than its factorization.

72644105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14528826.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 72644105 is about 8523.1511191577. The cubic root of 72644105 is about 417.2536321212.

The spelling of 72644105 in words is "seventy-two million, six hundred forty-four thousand, one hundred five".