72644003 has 2 divisors, whose sum is σ = 72644004. Its totient is φ = 72644002.

The previous prime is 72643997. The next prime is 72644017. The reversal of 72644003 is 30044627.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72644003 - 2¹⁴ = 72627619 is a prime.

It is not a weakly prime, because it can be changed into another prime (72644023) 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 as a sum of consecutive naturals, namely, 36322001 + 36322002.

It is an arithmetic number, because the mean of its divisors is an integer number (36322002).

Almost surely, 2^72644003 is an apocalyptic number.

72644003 is a deficient number, since it is larger than the sum of its proper divisors (1).

72644003 is an equidigital number, since it uses as much as digits as its factorization.

72644003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 72644003 is about 8523.1451354532. The cubic root of 72644003 is about 417.2534368317.

The spelling of 72644003 in words is "seventy-two million, six hundred forty-four thousand, three".