72663445 has 8 divisors (see below), whose sum is σ = 87246936. Its totient is φ = 58096896.

The previous prime is 72663401. The next prime is 72663499. The reversal of 72663445 is 54436627.

It can be written as a sum of positive squares in 4 ways, for example, as 4088484 + 68574961 = 2022^2 + 8281^2 .

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 72663445 - 2¹¹ = 72661397 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 7 ways as a sum of consecutive naturals, for example, 8929 + ... + 15001.

It is an arithmetic number, because the mean of its divisors is an integer number (10905867).

Almost surely, 2^72663445 is an apocalyptic number.

It is an amenable number.

72663445 is a deficient number, since it is larger than the sum of its proper divisors (14583491).

72663445 is a wasteful number, since it uses less digits than its factorization.

72663445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8471.

The product of its digits is 120960, while the sum is 37.

The square root of 72663445 is about 8524.2856005650. The cubic root of 72663445 is about 417.2906572371.

The spelling of 72663445 in words is "seventy-two million, six hundred sixty-three thousand, four hundred forty-five".