28028753625601 has 4 divisors (see below), whose sum is σ = 28786287507412. Its totient is φ = 27271219743792.

The previous prime is 28028753625599. The next prime is 28028753625623. The reversal of 28028753625601 is 10652635782082.

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 25411670918001 + 2617082707600 = 5040999^2 + 1617740^2 .

It is a cyclic number.

It is not a de Polignac number, because 28028753625601 - 2¹ = 28028753625599 is a prime.

It is a super-2 number, since 2×28028753625601² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28028754625601) 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, 378766940850 + ... + 378766940923.

It is an arithmetic number, because the mean of its divisors is an integer number (7196571876853).

Almost surely, 2^{28028753625601} is an apocalyptic number.

It is an amenable number.

28028753625601 is a deficient number, since it is larger than the sum of its proper divisors (757533881811).

28028753625601 is an equidigital number, since it uses as much as digits as its factorization.

28028753625601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757533881810.

The product of its (nonzero) digits is 9676800, while the sum is 55.

The spelling of 28028753625601 in words is "twenty-eight trillion, twenty-eight billion, seven hundred fifty-three million, six hundred twenty-five thousand, six hundred one".