72909371 has 4 divisors (see below), whose sum is σ = 73661112. Its totient is φ = 72157632.

The previous prime is 72909359. The next prime is 72909373. The reversal of 72909371 is 17390927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17390927 = 1949 ⋅8923.

It is a cyclic number.

It is not a de Polignac number, because 72909371 - 2¹⁸ = 72647227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72909373) 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, 375725 + ... + 375918.

It is an arithmetic number, because the mean of its divisors is an integer number (18415278).

Almost surely, 2^72909371 is an apocalyptic number.

72909371 is a deficient number, since it is larger than the sum of its proper divisors (751741).

72909371 is an equidigital number, since it uses as much as digits as its factorization.

72909371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751740.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 72909371 is about 8538.6984371156. The cubic root of 72909371 is about 417.7608939821.

It can be divided in two parts, 7290 and 9371, that added together give a palindrome (16661).

The spelling of 72909371 in words is "seventy-two million, nine hundred nine thousand, three hundred seventy-one".