72520538 has 8 divisors (see below), whose sum is σ = 115179732. Its totient is φ = 34127296.

The previous prime is 72520537. The next prime is 72520543. The reversal of 72520538 is 83502527.

It can be written as a sum of positive squares in 2 ways, for example, as 60109009 + 12411529 = 7753^2 + 3523^2 .

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

It is not an unprimeable number, because it can be changed into a prime (72520537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066445 + ... + 1066512.

Almost surely, 2^72520538 is an apocalyptic number.

72520538 is a deficient number, since it is larger than the sum of its proper divisors (42659194).

72520538 is a wasteful number, since it uses less digits than its factorization.

72520538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132976.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 72520538 is about 8515.8991304501. The cubic root of 72520538 is about 417.0169162359.

The spelling of 72520538 in words is "seventy-two million, five hundred twenty thousand, five hundred thirty-eight".