72506213 has 8 divisors (see below), whose sum is σ = 79900128. Its totient is φ = 65371824.

The previous prime is 72506201. The next prime is 72506219. The reversal of 72506213 is 31260527.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72506213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72506219) 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 in 7 ways as a sum of consecutive naturals, for example, 64295 + ... + 65412.

It is an arithmetic number, because the mean of its divisors is an integer number (9987516).

Almost surely, 2^72506213 is an apocalyptic number.

It is an amenable number.

72506213 is a deficient number, since it is larger than the sum of its proper divisors (7393915).

72506213 is a wasteful number, since it uses less digits than its factorization.

72506213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129763.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 72506213 is about 8515.0580150695. The cubic root of 72506213 is about 416.9894566092.

The spelling of 72506213 in words is "seventy-two million, five hundred six thousand, two hundred thirteen".