28897911923 has 4 divisors (see below), whose sum is σ = 28909840848. Its totient is φ = 28885983000.

The previous prime is 28897911877. The next prime is 28897911943. The reversal of 28897911923 is 32911979882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28897911923 - 2⁶ = 28897911859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28897911943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5960828 + ... + 5965673.

It is an arithmetic number, because the mean of its divisors is an integer number (7227460212).

Almost surely, 2^28897911923 is an apocalyptic number.

28897911923 is a deficient number, since it is larger than the sum of its proper divisors (11928925).

28897911923 is a wasteful number, since it uses less digits than its factorization.

28897911923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11928924.

The product of its digits is 3919104, while the sum is 59.

The spelling of 28897911923 in words is "twenty-eight billion, eight hundred ninety-seven million, nine hundred eleven thousand, nine hundred twenty-three".