28755331 has 4 divisors (see below), whose sum is σ = 31369464. Its totient is φ = 26141200.

The previous prime is 28755329. The next prime is 28755373. The reversal of 28755331 is 13355782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28755331 - 2¹ = 28755329 is a prime.

It is a super-2 number, since 2×28755331² = 1653738121839122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28755731) 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 3 ways as a sum of consecutive naturals, for example, 1307050 + ... + 1307071.

It is an arithmetic number, because the mean of its divisors is an integer number (7842366).

Almost surely, 2^28755331 is an apocalyptic number.

28755331 is a deficient number, since it is larger than the sum of its proper divisors (2614133).

28755331 is a wasteful number, since it uses less digits than its factorization.

28755331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2614132.

The product of its digits is 25200, while the sum is 34.

The square root of 28755331 is about 5362.3997426525. The cubic root of 28755331 is about 306.3652174554.

The spelling of 28755331 in words is "twenty-eight million, seven hundred fifty-five thousand, three hundred thirty-one".