28931037 has 4 divisors (see below), whose sum is σ = 38574720. Its totient is φ = 19287356.

The previous prime is 28931027. The next prime is 28931041. The reversal of 28931037 is 73013982.

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 28931037 - 2⁶ = 28930973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28930989 and 28931007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28931017) 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, 4821837 + ... + 4821842.

It is an arithmetic number, because the mean of its divisors is an integer number (9643680).

Almost surely, 2^28931037 is an apocalyptic number.

It is an amenable number.

28931037 is a deficient number, since it is larger than the sum of its proper divisors (9643683).

28931037 is an equidigital number, since it uses as much as digits as its factorization.

28931037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9643682.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 28931037 is about 5378.7579421275. The cubic root of 28931037 is about 306.9879534225.

The spelling of 28931037 in words is "twenty-eight million, nine hundred thirty-one thousand, thirty-seven".