28072715 has 16 divisors (see below), whose sum is σ = 37048320. Its totient is φ = 20250720.

The previous prime is 28072711. The next prime is 28072717. The reversal of 28072715 is 51727082.

It is not a de Polignac number, because 28072715 - 2² = 28072711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28072711) 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, 4976 + ... + 8994.

It is an arithmetic number, because the mean of its divisors is an integer number (2315520).

Almost surely, 2^28072715 is an apocalyptic number.

28072715 is a deficient number, since it is larger than the sum of its proper divisors (8975605).

28072715 is a wasteful number, since it uses less digits than its factorization.

28072715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4162.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 28072715 is about 5298.3690886913. The cubic root of 28072715 is about 303.9215337364.

Adding to 28072715 its reverse (51727082), we get a palindrome (79799797).

The spelling of 28072715 in words is "twenty-eight million, seventy-two thousand, seven hundred fifteen".