72321738 has 16 divisors (see below), whose sum is σ = 144978240. Its totient is φ = 24051456.

The previous prime is 72321731. The next prime is 72321749. The reversal of 72321738 is 83712327.

It is a junction number, because it is equal to n+sod(n) for n = 72321699 and 72321708.

It is not an unprimeable number, because it can be changed into a prime (72321731) 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, 11095 + ... + 16362.

It is an arithmetic number, because the mean of its divisors is an integer number (9061140).

Almost surely, 2^72321738 is an apocalyptic number.

72321738 is an abundant number, since it is smaller than the sum of its proper divisors (72656502).

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

72321738 is a wasteful number, since it uses less digits than its factorization.

72321738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27901.

The product of its digits is 14112, while the sum is 33.

The square root of 72321738 is about 8504.2188353781. The cubic root of 72321738 is about 416.6355124084.

The spelling of 72321738 in words is "seventy-two million, three hundred twenty-one thousand, seven hundred thirty-eight".