28088947 has 4 divisors (see below), whose sum is σ = 29741256. Its totient is φ = 26436640.

The previous prime is 28088927. The next prime is 28088959. The reversal of 28088947 is 74988082.

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 28088947 - 2¹⁹ = 27564659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28088897 and 28088906.

It is not an unprimeable number, because it can be changed into a prime (28088917) 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, 826129 + ... + 826162.

It is an arithmetic number, because the mean of its divisors is an integer number (7435314).

Almost surely, 2^28088947 is an apocalyptic number.

28088947 is a deficient number, since it is larger than the sum of its proper divisors (1652309).

28088947 is a wasteful number, since it uses less digits than its factorization.

28088947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652308.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 28088947 is about 5299.9006594464. The cubic root of 28088947 is about 303.9800995456.

The spelling of 28088947 in words is "twenty-eight million, eighty-eight thousand, nine hundred forty-seven".