28820203 has 4 divisors (see below), whose sum is σ = 28923048. Its totient is φ = 28717360.

The previous prime is 28820179. The next prime is 28820221. The reversal of 28820203 is 30202882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30202882 = 2 ⋅15101441.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28820203 is a prime.

It is a super-2 number, since 2×28820203² = 1661208201922418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28820263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51001 + ... + 51562.

It is an arithmetic number, because the mean of its divisors is an integer number (7230762).

Almost surely, 2^28820203 is an apocalyptic number.

28820203 is a deficient number, since it is larger than the sum of its proper divisors (102845).

28820203 is a wasteful number, since it uses less digits than its factorization.

28820203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102844.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 28820203 is about 5368.4451193991. The cubic root of 28820203 is about 306.5954309702.

The spelling of 28820203 in words is "twenty-eight million, eight hundred twenty thousand, two hundred three".