72531603 has 6 divisors (see below), whose sum is σ = 104767884. Its totient is φ = 48354396.

The previous prime is 72531593. The next prime is 72531611. The reversal of 72531603 is 30613527.

It is a happy number.

72531603 is a `hidden beast` number, since 7 + 2 + 53 + 1 + 603 = 666.

It is not a de Polignac number, because 72531603 - 2⁶ = 72531539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72531643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4029525 + ... + 4029542.

It is an arithmetic number, because the mean of its divisors is an integer number (17461314).

Almost surely, 2^72531603 is an apocalyptic number.

72531603 is a deficient number, since it is larger than the sum of its proper divisors (32236281).

72531603 is a wasteful number, since it uses less digits than its factorization.

72531603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8059073 (or 8059070 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 72531603 is about 8516.5487728305. The cubic root of 72531603 is about 417.0381242855.

The spelling of 72531603 in words is "seventy-two million, five hundred thirty-one thousand, six hundred three".