72203605 has 8 divisors (see below), whose sum is σ = 86852664. Its totient is φ = 57624000.

The previous prime is 72203603. The next prime is 72203623. The reversal of 72203605 is 50630227.

It can be written as a sum of positive squares in 4 ways, for example, as 5503716 + 66699889 = 2346^2 + 8167^2 .

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

It is not a de Polignac number, because 72203605 - 2¹ = 72203603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72203605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72203603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15046 + ... + 19255.

It is an arithmetic number, because the mean of its divisors is an integer number (10856583).

Almost surely, 2^72203605 is an apocalyptic number.

It is an amenable number.

72203605 is a deficient number, since it is larger than the sum of its proper divisors (14649059).

72203605 is a wasteful number, since it uses less digits than its factorization.

72203605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34727.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 72203605 is about 8497.2704440897. The cubic root of 72203605 is about 416.4085394997.

The spelling of 72203605 in words is "seventy-two million, two hundred three thousand, six hundred five".