28103381 has 8 divisors (see below), whose sum is σ = 29124480. Its totient is φ = 27099072.

The previous prime is 28103357. The next prime is 28103393. The reversal of 28103381 is 18330182.

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 28103381 - 2¹⁸ = 27841237 is a prime.

It is a super-2 number, since 2×28103381² = 1579600047262322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28103381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28100381) 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, 740 + ... + 7533.

It is an arithmetic number, because the mean of its divisors is an integer number (3640560).

Almost surely, 2^28103381 is an apocalyptic number.

It is an amenable number.

28103381 is a deficient number, since it is larger than the sum of its proper divisors (1021099).

28103381 is an equidigital number, since it uses as much as digits as its factorization.

28103381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8395.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 28103381 is about 5301.2622081916. The cubic root of 28103381 is about 304.0321591383.

The spelling of 28103381 in words is "twenty-eight million, one hundred three thousand, three hundred eighty-one".