28147957 has 4 divisors (see below), whose sum is σ = 28252096. Its totient is φ = 28043820.

The previous prime is 28147939. The next prime is 28147979. The reversal of 28147957 is 75974182.

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-28147957 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 (28147927) 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, 51663 + ... + 52204.

It is an arithmetic number, because the mean of its divisors is an integer number (7063024).

Almost surely, 2^28147957 is an apocalyptic number.

It is an amenable number.

28147957 is a deficient number, since it is larger than the sum of its proper divisors (104139).

28147957 is a wasteful number, since it uses less digits than its factorization.

28147957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104138.

The product of its digits is 141120, while the sum is 43.

The square root of 28147957 is about 5305.4648241224. The cubic root of 28147957 is about 304.1928204529.

The spelling of 28147957 in words is "twenty-eight million, one hundred forty-seven thousand, nine hundred fifty-seven".