28042357 has 12 divisors (see below), whose sum is σ = 32830176. Its totient is φ = 23882040.

The previous prime is 28042349. The next prime is 28042363. The reversal of 28042357 is 75324082.

It is not a de Polignac number, because 28042357 - 2³ = 28042349 is a prime.

It is a super-3 number, since 3×28042357³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28042307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6232 + ... + 9742.

It is an arithmetic number, because the mean of its divisors is an integer number (2735848).

Almost surely, 2^28042357 is an apocalyptic number.

It is an amenable number.

28042357 is a deficient number, since it is larger than the sum of its proper divisors (4787819).

28042357 is a wasteful number, since it uses less digits than its factorization.

28042357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688 (or 3681 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 28042357 is about 5295.5034699262. The cubic root of 28042357 is about 303.8119400405.

The spelling of 28042357 in words is "twenty-eight million, forty-two thousand, three hundred fifty-seven".