28764137 has 4 divisors (see below), whose sum is σ = 29128320. Its totient is φ = 28399956.

The previous prime is 28764091. The next prime is 28764139. The reversal of 28764137 is 73146782.

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 a de Polignac number, because none of the positive numbers 2^k-28764137 is a prime.

It is a super-3 number, since 3×28764137³ (a number of 23 digits) contains 333 as substring.

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 28764137.

It is not an unprimeable number, because it can be changed into a prime (28764139) 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 3 ways as a sum of consecutive naturals, for example, 181973 + ... + 182130.

It is an arithmetic number, because the mean of its divisors is an integer number (7282080).

Almost surely, 2^28764137 is an apocalyptic number.

It is an amenable number.

28764137 is a deficient number, since it is larger than the sum of its proper divisors (364183).

28764137 is an equidigital number, since it uses as much as digits as its factorization.

28764137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364182.

The product of its digits is 56448, while the sum is 38.

The square root of 28764137 is about 5363.2207674121. The cubic root of 28764137 is about 306.3964879093.

The spelling of 28764137 in words is "twenty-eight million, seven hundred sixty-four thousand, one hundred thirty-seven".