28500013 has 8 divisors (see below), whose sum is σ = 30431808. Its totient is φ = 26625984.

The previous prime is 28499971. The next prime is 28500023. The reversal of 28500013 is 31000582.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28500013 - 2¹⁷ = 28368941 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 (28500023) 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, 13420 + ... + 15397.

It is an arithmetic number, because the mean of its divisors is an integer number (3803976).

Almost surely, 2^28500013 is an apocalyptic number.

28500013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28500013 is a deficient number, since it is larger than the sum of its proper divisors (1931795).

28500013 is a wasteful number, since it uses less digits than its factorization.

28500013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28883.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 28500013 is about 5338.5403435771. The cubic root of 28500013 is about 305.4557836580.

Adding to 28500013 its reverse (31000582), we get a palindrome (59500595).

The spelling of 28500013 in words is "twenty-eight million, five hundred thousand, thirteen".