28018901 has 16 divisors (see below), whose sum is σ = 30782400. Its totient is φ = 25401600.

The previous prime is 28018897. The next prime is 28018919. The reversal of 28018901 is 10981082.

It is a cyclic number.

It is not a de Polignac number, because 28018901 - 2² = 28018897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28011901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116141 + ... + 116381.

It is an arithmetic number, because the mean of its divisors is an integer number (1923900).

Almost surely, 2^28018901 is an apocalyptic number.

It is an amenable number.

28018901 is a deficient number, since it is larger than the sum of its proper divisors (2763499).

28018901 is a wasteful number, since it uses less digits than its factorization.

28018901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 28018901 is about 5293.2882974575. The cubic root of 28018901 is about 303.7272086858.

Adding to 28018901 its reverse (10981082), we get a palindrome (38999983).

The spelling of 28018901 in words is "twenty-eight million, eighteen thousand, nine hundred one".