28380015 has 36 divisors (see below), whose sum is σ = 51947064. Its totient is φ = 14331168.

The previous prime is 28379993. The next prime is 28380019. The reversal of 28380015 is 51008382.

It is a happy number.

It is not a de Polignac number, because 28380015 - 2⁷ = 28379887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28380019) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15372 + ... + 17118.

It is an arithmetic number, because the mean of its divisors is an integer number (1442974).

Almost surely, 2^28380015 is an apocalyptic number.

28380015 is a deficient number, since it is larger than the sum of its proper divisors (23567049).

28380015 is a wasteful number, since it uses less digits than its factorization.

28380015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796 (or 1774 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28380015 is about 5327.2896485924. The cubic root of 28380015 is about 305.0264780381.

Adding to 28380015 its reverse (51008382), we get a palindrome (79388397).

The spelling of 28380015 in words is "twenty-eight million, three hundred eighty thousand, fifteen".