72299381 has 8 divisors (see below), whose sum is σ = 90139584. Its totient is φ = 56337120.

The previous prime is 72299377. The next prime is 72299387. The reversal of 72299381 is 18399227.

It is a happy number.

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

It is not a de Polignac number, because 72299381 - 2² = 72299377 is a prime.

It is a super-2 number, since 2×72299381² = 10454400985966322, 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 (72299387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469400 + ... + 469553.

It is an arithmetic number, because the mean of its divisors is an integer number (11267448).

Almost surely, 2^72299381 is an apocalyptic number.

It is an amenable number.

72299381 is a deficient number, since it is larger than the sum of its proper divisors (17840203).

72299381 is a wasteful number, since it uses less digits than its factorization.

72299381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938971.

The product of its digits is 54432, while the sum is 41.

The square root of 72299381 is about 8502.9042685426. The cubic root of 72299381 is about 416.5925761240.

The spelling of 72299381 in words is "seventy-two million, two hundred ninety-nine thousand, three hundred eighty-one".