28176947 has 4 divisors (see below), whose sum is σ = 28356576. Its totient is φ = 27997320.

The previous prime is 28176913. The next prime is 28176949. The reversal of 28176947 is 74967182.

28176947 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74967182 = 2 ⋅37483591.

It is a cyclic number.

It is not a de Polignac number, because 28176947 - 2⁸ = 28176691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28176898 and 28176907.

It is not an unprimeable number, because it can be changed into a prime (28176949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89579 + ... + 89892.

It is an arithmetic number, because the mean of its divisors is an integer number (7089144).

Almost surely, 2^28176947 is an apocalyptic number.

28176947 is a deficient number, since it is larger than the sum of its proper divisors (179629).

28176947 is a wasteful number, since it uses less digits than its factorization.

28176947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179628.

The product of its digits is 169344, while the sum is 44.

The square root of 28176947 is about 5308.1962096366. The cubic root of 28176947 is about 304.2972155267.

The spelling of 28176947 in words is "twenty-eight million, one hundred seventy-six thousand, nine hundred forty-seven".