72359381 has 4 divisors (see below), whose sum is σ = 73105452. Its totient is φ = 71613312.

The previous prime is 72359347. The next prime is 72359407. The reversal of 72359381 is 18395327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18395327 = 37 ⋅497171.

It can be written as a sum of positive squares in 2 ways, for example, as 40436881 + 31922500 = 6359^2 + 5650^2 .

It is a cyclic number.

It is not a de Polignac number, because 72359381 - 2¹⁰ = 72358357 is a prime.

It is a super-2 number, since 2×72359381² = 10471760037406322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72359341) 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, 372890 + ... + 373083.

It is an arithmetic number, because the mean of its divisors is an integer number (18276363).

Almost surely, 2^72359381 is an apocalyptic number.

It is an amenable number.

72359381 is a deficient number, since it is larger than the sum of its proper divisors (746071).

72359381 is an equidigital number, since it uses as much as digits as its factorization.

72359381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746070.

The product of its digits is 45360, while the sum is 38.

The square root of 72359381 is about 8506.4317430989. The cubic root of 72359381 is about 416.7077852399.

The spelling of 72359381 in words is "seventy-two million, three hundred fifty-nine thousand, three hundred eighty-one".