28957266641 has 4 divisors (see below), whose sum is σ = 29323814400. Its totient is φ = 28590718884.

The previous prime is 28957266623. The next prime is 28957266671. The reversal of 28957266641 is 14666275982.

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-28957266641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28957266671) 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, 183273761 + ... + 183273918.

It is an arithmetic number, because the mean of its divisors is an integer number (7330953600).

Almost surely, 2^28957266641 is an apocalyptic number.

It is an amenable number.

28957266641 is a deficient number, since it is larger than the sum of its proper divisors (366547759).

28957266641 is an equidigital number, since it uses as much as digits as its factorization.

28957266641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366547758.

The product of its digits is 8709120, while the sum is 56.

The spelling of 28957266641 in words is "twenty-eight billion, nine hundred fifty-seven million, two hundred sixty-six thousand, six hundred forty-one".