28372381 has 8 divisors (see below), whose sum is σ = 29248128. Its totient is φ = 27510000.

The previous prime is 28372321. The next prime is 28372387. The reversal of 28372381 is 18327382.

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

It is a cyclic number.

It is not a de Polignac number, because 28372381 - 2⁹ = 28371869 is a prime.

It is a super-2 number, since 2×28372381² = 1609984007218322, 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 (28372387) 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, 1056 + ... + 7606.

It is an arithmetic number, because the mean of its divisors is an integer number (3656016).

Almost surely, 2^28372381 is an apocalyptic number.

It is an amenable number.

28372381 is a deficient number, since it is larger than the sum of its proper divisors (875747).

28372381 is an equidigital number, since it uses as much as digits as its factorization.

28372381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6683.

The product of its digits is 16128, while the sum is 34.

The square root of 28372381 is about 5326.5731009721. The cubic root of 28372381 is about 304.9991256806. Note that the first 3 decimals are identical.

The spelling of 28372381 in words is "twenty-eight million, three hundred seventy-two thousand, three hundred eighty-one".