28767121 has 4 divisors (see below), whose sum is σ = 30281200. Its totient is φ = 27253044.

The previous prime is 28767119. The next prime is 28767127. The reversal of 28767121 is 12176782.

It is a happy number.

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 28767121 - 2¹ = 28767119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28767127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757011 + ... + 757048.

It is an arithmetic number, because the mean of its divisors is an integer number (7570300).

Almost surely, 2^28767121 is an apocalyptic number.

It is an amenable number.

28767121 is a deficient number, since it is larger than the sum of its proper divisors (1514079).

28767121 is a wasteful number, since it uses less digits than its factorization.

28767121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514078.

The product of its digits is 9408, while the sum is 34.

The square root of 28767121 is about 5363.4989512444. The cubic root of 28767121 is about 306.4070827634.

The spelling of 28767121 in words is "twenty-eight million, seven hundred sixty-seven thousand, one hundred twenty-one".