28938757 has 4 divisors (see below), whose sum is σ = 28956096. Its totient is φ = 28921420.

The previous prime is 28938719. The next prime is 28938769. The reversal of 28938757 is 75783982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28938757 - 2⁷ = 28938629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28938757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28938787) 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 in 3 ways as a sum of consecutive naturals, for example, 5863 + ... + 9604.

It is an arithmetic number, because the mean of its divisors is an integer number (7239024).

Almost surely, 2^28938757 is an apocalyptic number.

It is an amenable number.

28938757 is a deficient number, since it is larger than the sum of its proper divisors (17339).

28938757 is a wasteful number, since it uses less digits than its factorization.

28938757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17338.

The product of its digits is 846720, while the sum is 49.

The square root of 28938757 is about 5379.4755320570. The cubic root of 28938757 is about 307.0152566981.

It can be divided in two parts, 289387 and 57, that added together give a square (289444 = 538²).

The spelling of 28938757 in words is "twenty-eight million, nine hundred thirty-eight thousand, seven hundred fifty-seven".