28870113 has 16 divisors (see below), whose sum is σ = 39254336. Its totient is φ = 18869760.

The previous prime is 28870111. The next prime is 28870117. The reversal of 28870113 is 31107882.

It is a happy number.

It is not a de Polignac number, because 28870113 - 2¹ = 28870111 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28870111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52506 + ... + 53052.

It is an arithmetic number, because the mean of its divisors is an integer number (2453396).

Almost surely, 2^28870113 is an apocalyptic number.

It is an amenable number.

28870113 is a deficient number, since it is larger than the sum of its proper divisors (10384223).

28870113 is a wasteful number, since it uses less digits than its factorization.

28870113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 28870113 is about 5373.0915681756. The cubic root of 28870113 is about 306.7723132908.

Adding to 28870113 its reverse (31107882), we get a palindrome (59977995).

The spelling of 28870113 in words is "twenty-eight million, eight hundred seventy thousand, one hundred thirteen".