28739897 has 4 divisors (see below), whose sum is σ = 28758096. Its totient is φ = 28721700.

The previous prime is 28739891. The next prime is 28739917. The reversal of 28739897 is 79893782.

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 28739897 - 2¹² = 28735801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28739891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6479 + ... + 9972.

It is an arithmetic number, because the mean of its divisors is an integer number (7189524).

Almost surely, 2^28739897 is an apocalyptic number.

It is an amenable number.

28739897 is a deficient number, since it is larger than the sum of its proper divisors (18199).

28739897 is a wasteful number, since it uses less digits than its factorization.

28739897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18198.

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

The square root of 28739897 is about 5360.9604549931. The cubic root of 28739897 is about 306.3103953079.

The spelling of 28739897 in words is "twenty-eight million, seven hundred thirty-nine thousand, eight hundred ninety-seven".