28912121161575 has 24 divisors (see below), whose sum is σ = 47816486715648. Its totient is φ = 15414922771680.

The previous prime is 28912121161559. The next prime is 28912121161577. The reversal of 28912121161575 is 57516112121982.

It is not a de Polignac number, because 28912121161575 - 2⁴ = 28912121161559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28912121161577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60700959 + ... + 61175408.

It is an arithmetic number, because the mean of its divisors is an integer number (1992353613152).

Almost surely, 2^{28912121161575} is an apocalyptic number.

28912121161575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28912121161575 is a deficient number, since it is larger than the sum of its proper divisors (18904365554073).

28912121161575 is a wasteful number, since it uses less digits than its factorization.

28912121161575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121879543 (or 121879538 counting only the distinct ones).

The product of its digits is 604800, while the sum is 51.

The spelling of 28912121161575 in words is "twenty-eight trillion, nine hundred twelve billion, one hundred twenty-one million, one hundred sixty-one thousand, five hundred seventy-five".