28394554 has 4 divisors (see below), whose sum is σ = 42591834. Its totient is φ = 14197276.

The previous prime is 28394537. The next prime is 28394557. The reversal of 28394554 is 45549382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45549382 = 2 ⋅22774691.

It can be written as a sum of positive squares in only one way, i.e., 17682025 + 10712529 = 4205^2 + 3273^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28394557) 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 as a sum of consecutive naturals, namely, 7098637 + ... + 7098640.

Almost surely, 2^28394554 is an apocalyptic number.

28394554 is a deficient number, since it is larger than the sum of its proper divisors (14197280).

28394554 is a wasteful number, since it uses less digits than its factorization.

28394554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14197279.

The product of its digits is 172800, while the sum is 40.

The square root of 28394554 is about 5328.6540514468. The cubic root of 28394554 is about 305.0785572080.

The spelling of 28394554 in words is "twenty-eight million, three hundred ninety-four thousand, five hundred fifty-four".