28772097 has 4 divisors (see below), whose sum is σ = 38362800. Its totient is φ = 19181396.

The previous prime is 28772077. The next prime is 28772141. The reversal of 28772097 is 79027782.

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 28772097 - 2¹⁵ = 28739329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28772077) 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, 4795347 + ... + 4795352.

It is an arithmetic number, because the mean of its divisors is an integer number (9590700).

Almost surely, 2^28772097 is an apocalyptic number.

It is an amenable number.

28772097 is a deficient number, since it is larger than the sum of its proper divisors (9590703).

28772097 is an equidigital number, since it uses as much as digits as its factorization.

28772097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9590702.

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 28772097 is about 5363.9628074773. The cubic root of 28772097 is about 306.4247486923.

The spelling of 28772097 in words is "twenty-eight million, seven hundred seventy-two thousand, ninety-seven".