28907516401 has 4 divisors (see below), whose sum is σ = 29205532132. Its totient is φ = 28609500672.

The previous prime is 28907516369. The next prime is 28907516413. The reversal of 28907516401 is 10461570982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12007776400 + 16899740001 = 109580^2 + 129999^2 .

It is a cyclic number.

It is not a de Polignac number, because 28907516401 - 2⁵ = 28907516369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28907516471) 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, 149007720 + ... + 149007913.

It is an arithmetic number, because the mean of its divisors is an integer number (7301383033).

Almost surely, 2^28907516401 is an apocalyptic number.

It is an amenable number.

28907516401 is a deficient number, since it is larger than the sum of its proper divisors (298015731).

28907516401 is an equidigital number, since it uses as much as digits as its factorization.

28907516401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298015730.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 28907516401 in words is "twenty-eight billion, nine hundred seven million, five hundred sixteen thousand, four hundred one".