28557394 has 16 divisors (see below), whose sum is σ = 44104320. Its totient is φ = 13862160.

The previous prime is 28557391. The next prime is 28557427. The reversal of 28557394 is 49375582.

It is a self number, because there is not a number n which added to its sum of digits gives 28557394.

It is not an unprimeable number, because it can be changed into a prime (28557391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8157 + ... + 11119.

It is an arithmetic number, because the mean of its divisors is an integer number (2756520).

Almost surely, 2^28557394 is an apocalyptic number.

28557394 is a deficient number, since it is larger than the sum of its proper divisors (15546926).

28557394 is a wasteful number, since it uses less digits than its factorization.

28557394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105.

The product of its digits is 302400, while the sum is 43.

The square root of 28557394 is about 5343.9118630456. The cubic root of 28557394 is about 305.6606444822.

The spelling of 28557394 in words is "twenty-eight million, five hundred fifty-seven thousand, three hundred ninety-four".