28406930947201 has 4 divisors (see below), whose sum is σ = 28477771174404. Its totient is φ = 28336090720000.

The previous prime is 28406930947193. The next prime is 28406930947211. The reversal of 28406930947201 is 10274903960482.

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 27886859201601 + 520071745600 = 5280801^2 + 721160^2 .

It is a cyclic number.

It is not a de Polignac number, because 28406930947201 - 2³ = 28406930947193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28406930947211) 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, 35420113000 + ... + 35420113801.

It is an arithmetic number, because the mean of its divisors is an integer number (7119442793601).

Almost surely, 2^{28406930947201} is an apocalyptic number.

It is an amenable number.

28406930947201 is a deficient number, since it is larger than the sum of its proper divisors (70840227203).

28406930947201 is an equidigital number, since it uses as much as digits as its factorization.

28406930947201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70840227202.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 28406930947201 in words is "twenty-eight trillion, four hundred six billion, nine hundred thirty million, nine hundred forty-seven thousand, two hundred one".