72207138 has 8 divisors (see below), whose sum is σ = 144414288. Its totient is φ = 24069044.

The previous prime is 72207133. The next prime is 72207169. The reversal of 72207138 is 83170227.

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

72207138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (72207133) 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, 6017256 + ... + 6017267.

It is an arithmetic number, because the mean of its divisors is an integer number (18051786).

Almost surely, 2^72207138 is an apocalyptic number.

72207138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72207138 is a wasteful number, since it uses less digits than its factorization.

72207138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12034528.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 72207138 is about 8497.4783318347. The cubic root of 72207138 is about 416.4153311614.

The spelling of 72207138 in words is "seventy-two million, two hundred seven thousand, one hundred thirty-eight".