28155757 has 16 divisors (see below), whose sum is σ = 34255872. Its totient is φ = 22590720.

The previous prime is 28155737. The next prime is 28155761. The reversal of 28155757 is 75755182.

It is a cyclic number.

It is not a de Polignac number, because 28155757 - 2¹⁹ = 27631469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28155707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26007 + ... + 27067.

It is an arithmetic number, because the mean of its divisors is an integer number (2140992).

Almost surely, 2^28155757 is an apocalyptic number.

It is an amenable number.

28155757 is a deficient number, since it is larger than the sum of its proper divisors (6100115).

28155757 is a wasteful number, since it uses less digits than its factorization.

28155757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308.

The product of its digits is 98000, while the sum is 40.

The square root of 28155757 is about 5306.1998643097. The cubic root of 28155757 is about 304.2209158592.

The spelling of 28155757 in words is "twenty-eight million, one hundred fifty-five thousand, seven hundred fifty-seven".