28176047 has 4 divisors (see below), whose sum is σ = 28251960. Its totient is φ = 28100136.

The previous prime is 28176041. The next prime is 28176067. The reversal of 28176047 is 74067182.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28176047 - 2¹² = 28171951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28175998 and 28176016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28176041) 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, 37397 + ... + 38142.

It is an arithmetic number, because the mean of its divisors is an integer number (7062990).

Almost surely, 2^28176047 is an apocalyptic number.

28176047 is a deficient number, since it is larger than the sum of its proper divisors (75913).

28176047 is an equidigital number, since it uses as much as digits as its factorization.

28176047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75912.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 28176047 is about 5308.1114343992. Note that the first 3 decimals coincide. The cubic root of 28176047 is about 304.2939756392.

The spelling of 28176047 in words is "twenty-eight million, one hundred seventy-six thousand, forty-seven".