28840427 has 32 divisors (see below), whose sum is σ = 37822464. Its totient is φ = 21340800.

The previous prime is 28840417. The next prime is 28840463. The reversal of 28840427 is 72404882.

It is a cyclic number.

It is not a de Polignac number, because 28840427 - 2⁴ = 28840411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28840417) 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 31 ways as a sum of consecutive naturals, for example, 150902 + ... + 151092.

It is an arithmetic number, because the mean of its divisors is an integer number (1181952).

Almost surely, 2^28840427 is an apocalyptic number.

28840427 is a deficient number, since it is larger than the sum of its proper divisors (8982037).

28840427 is a wasteful number, since it uses less digits than its factorization.

28840427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299.

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 28840427 is about 5370.3283884694. The cubic root of 28840427 is about 306.6671299352.

The spelling of 28840427 in words is "twenty-eight million, eight hundred forty thousand, four hundred twenty-seven".