28920874577 has 4 divisors (see below), whose sum is σ = 33052428096. Its totient is φ = 24789321060.

The previous prime is 28920874571. The next prime is 28920874607. The reversal of 28920874577 is 77547802982.

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 not a de Polignac number, because 28920874577 - 2⁴ = 28920874561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28920874571) 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, 2065776749 + ... + 2065776762.

It is an arithmetic number, because the mean of its divisors is an integer number (8263107024).

Almost surely, 2^28920874577 is an apocalyptic number.

It is an amenable number.

28920874577 is a deficient number, since it is larger than the sum of its proper divisors (4131553519).

28920874577 is an equidigital number, since it uses as much as digits as its factorization.

28920874577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131553518.

The product of its (nonzero) digits is 15805440, while the sum is 59.

The spelling of 28920874577 in words is "twenty-eight billion, nine hundred twenty million, eight hundred seventy-four thousand, five hundred seventy-seven".