28642338466561 has 8 divisors (see below), whose sum is σ = 29580793470720. Its totient is φ = 27712532817648.

The previous prime is 28642338466523. The next prime is 28642338466603. The reversal of 28642338466561 is 16566483324682.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28642338466561 - 2²⁵ = 28642304912129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28642338466493 and 28642338466502.

It is not an unprimeable number, because it can be changed into a prime (28642338466361) 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, 2162332081 + ... + 2162345326.

It is an arithmetic number, because the mean of its divisors is an integer number (3697599183840).

Almost surely, 2^{28642338466561} is an apocalyptic number.

It is an amenable number.

28642338466561 is a deficient number, since it is larger than the sum of its proper divisors (938455004159).

28642338466561 is a wasteful number, since it uses less digits than its factorization.

28642338466561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4324677623.

The product of its digits is 238878720, while the sum is 64.

The spelling of 28642338466561 in words is "twenty-eight trillion, six hundred forty-two billion, three hundred thirty-eight million, four hundred sixty-six thousand, five hundred sixty-one".