72213037 has 4 divisors (see below), whose sum is σ = 77767900. Its totient is φ = 66658176.

The previous prime is 72213023. The next prime is 72213041. The reversal of 72213037 is 73031227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21104836 + 51108201 = 4594^2 + 7149^2 .

It is a de Polignac number, because none of the positive numbers 2^k-72213037 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 (72213007) 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 3 ways as a sum of consecutive naturals, for example, 2777412 + ... + 2777437.

It is an arithmetic number, because the mean of its divisors is an integer number (19441975).

Almost surely, 2^72213037 is an apocalyptic number.

It is an amenable number.

72213037 is a deficient number, since it is larger than the sum of its proper divisors (5554863).

72213037 is a wasteful number, since it uses less digits than its factorization.

72213037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554862.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 72213037 is about 8497.8254277197. The cubic root of 72213037 is about 416.4266706089.

The spelling of 72213037 in words is "seventy-two million, two hundred thirteen thousand, thirty-seven".