72316381 has 4 divisors (see below), whose sum is σ = 72619200. Its totient is φ = 72013564.

The previous prime is 72316373. The next prime is 72316399. The reversal of 72316381 is 18361327.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18361327 = 3673 ⋅4999.

It is a cyclic number.

It is not a de Polignac number, because 72316381 - 2³ = 72316373 is a prime.

It is a super-2 number, since 2×72316381² = 10459317921874322, 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 (72316481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151051 + ... + 151528.

It is an arithmetic number, because the mean of its divisors is an integer number (18154800).

Almost surely, 2^72316381 is an apocalyptic number.

It is an amenable number.

72316381 is a deficient number, since it is larger than the sum of its proper divisors (302819).

72316381 is a wasteful number, since it uses less digits than its factorization.

72316381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302818.

The product of its digits is 6048, while the sum is 31.

The square root of 72316381 is about 8503.9038682243. The cubic root of 72316381 is about 416.6252251762.

The spelling of 72316381 in words is "seventy-two million, three hundred sixteen thousand, three hundred eighty-one".