28837997 has 4 divisors (see below), whose sum is σ = 28877760. Its totient is φ = 28798236.

The previous prime is 28837987. The next prime is 28838009. The reversal of 28837997 is 79973882.

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 28837997 - 2⁴ = 28837981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28837927) 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, 18773 + ... + 20250.

It is an arithmetic number, because the mean of its divisors is an integer number (7219440).

Almost surely, 2^28837997 is an apocalyptic number.

It is an amenable number.

28837997 is a deficient number, since it is larger than the sum of its proper divisors (39763).

28837997 is an equidigital number, since it uses as much as digits as its factorization.

28837997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39762.

The product of its digits is 1524096, while the sum is 53.

The square root of 28837997 is about 5370.1021405556. The cubic root of 28837997 is about 306.6585167704.

The spelling of 28837997 in words is "twenty-eight million, eight hundred thirty-seven thousand, nine hundred ninety-seven".