72213513 has 4 divisors (see below), whose sum is σ = 96284688. Its totient is φ = 48142340.

The previous prime is 72213511. The next prime is 72213527. The reversal of 72213513 is 31531227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72213513 - 2¹ = 72213511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72213511) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 12035583 + ... + 12035588.

It is an arithmetic number, because the mean of its divisors is an integer number (24071172).

Almost surely, 2^72213513 is an apocalyptic number.

It is an amenable number.

72213513 is a deficient number, since it is larger than the sum of its proper divisors (24071175).

72213513 is a wasteful number, since it uses less digits than its factorization.

72213513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24071174.

The product of its digits is 1260, while the sum is 24.

The square root of 72213513 is about 8497.8534348387. The cubic root of 72213513 is about 416.4275855806.

The spelling of 72213513 in words is "seventy-two million, two hundred thirteen thousand, five hundred thirteen".