28211801601 has 8 divisors (see below), whose sum is σ = 37616539744. Its totient is φ = 18807465600.

The previous prime is 28211801581. The next prime is 28211801603. The reversal of 28211801601 is 10610811282.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28211801601 - 2⁶ = 28211801537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28211801603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158526 + ... + 285576.

It is an arithmetic number, because the mean of its divisors is an integer number (4702067468).

Almost surely, 2^28211801601 is an apocalyptic number.

It is an amenable number.

28211801601 is a deficient number, since it is larger than the sum of its proper divisors (9404738143).

28211801601 is a wasteful number, since it uses less digits than its factorization.

28211801601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201071.

The product of its (nonzero) digits is 1536, while the sum is 30.

The spelling of 28211801601 in words is "twenty-eight billion, two hundred eleven million, eight hundred one thousand, six hundred one".