28145013 has 16 divisors (see below), whose sum is σ = 42791616. Its totient is φ = 16300800.

The previous prime is 28145009. The next prime is 28145017. The reversal of 28145013 is 31054182.

It is an interprime number because it is at equal distance from previous prime (28145009) and next prime (28145017).

It is not a de Polignac number, because 28145013 - 2² = 28145009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28145017) 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, 20563 + ... + 21888.

It is an arithmetic number, because the mean of its divisors is an integer number (2674476).

Almost surely, 2^28145013 is an apocalyptic number.

It is an amenable number.

28145013 is a deficient number, since it is larger than the sum of its proper divisors (14646603).

28145013 is a wasteful number, since it uses less digits than its factorization.

28145013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42484.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 28145013 is about 5305.1873670965. The cubic root of 28145013 is about 304.1822148888.

Adding to 28145013 its reverse (31054182), we get a palindrome (59199195).

The spelling of 28145013 in words is "twenty-eight million, one hundred forty-five thousand, thirteen".