28342557 has 6 divisors (see below), whose sum is σ = 40939262. Its totient is φ = 18895032.

The previous prime is 28342529. The next prime is 28342571. The reversal of 28342557 is 75524382.

It can be written as a sum of positive squares in only one way, i.e., 22838841 + 5503716 = 4779^2 + 2346^2 .

It is not a de Polignac number, because 28342557 - 2⁷ = 28342429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28342577) 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 5 ways as a sum of consecutive naturals, for example, 1574578 + ... + 1574595.

Almost surely, 2^28342557 is an apocalyptic number.

It is an amenable number.

28342557 is a deficient number, since it is larger than the sum of its proper divisors (12596705).

28342557 is a wasteful number, since it uses less digits than its factorization.

28342557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3149179 (or 3149176 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 28342557 is about 5323.7728163399. The cubic root of 28342557 is about 304.8922202712.

The spelling of 28342557 in words is "twenty-eight million, three hundred forty-two thousand, five hundred fifty-seven".