28232099758081 has 4 divisors (see below), whose sum is σ = 28236496602964. Its totient is φ = 28227702913200.

The previous prime is 28232099758063. The next prime is 28232099758091. The reversal of 28232099758081 is 18085799023282.

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 5526302954481 + 22705796803600 = 2350809^2 + 4765060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28232099758081 is a prime.

It is a super-2 number, since 2×28232099758081² (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 (28232099758061) 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, 2198412810 + ... + 2198425651.

It is an arithmetic number, because the mean of its divisors is an integer number (7059124150741).

Almost surely, 2^{28232099758081} is an apocalyptic number.

It is an amenable number.

28232099758081 is a deficient number, since it is larger than the sum of its proper divisors (4396844883).

28232099758081 is an equidigital number, since it uses as much as digits as its factorization.

28232099758081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4396844882.

The product of its (nonzero) digits is 34836480, while the sum is 64.

The spelling of 28232099758081 in words is "twenty-eight trillion, two hundred thirty-two billion, ninety-nine million, seven hundred fifty-eight thousand, eighty-one".