28103997 has 8 divisors (see below), whose sum is σ = 37507744. Its totient is φ = 18718128.

The previous prime is 28103947. The next prime is 28104007. The reversal of 28103997 is 79930182.

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

It is not a de Polignac number, because 28103997 - 2⁸ = 28103741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28103947) 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, 223 + ... + 7500.

It is an arithmetic number, because the mean of its divisors is an integer number (4688468).

Almost surely, 2^28103997 is an apocalyptic number.

It is an amenable number.

28103997 is a deficient number, since it is larger than the sum of its proper divisors (9403747).

28103997 is a wasteful number, since it uses less digits than its factorization.

28103997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8939.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 28103997 is about 5301.3203072442. The cubic root of 28103997 is about 304.0343804895.

The spelling of 28103997 in words is "twenty-eight million, one hundred three thousand, nine hundred ninety-seven".