28423643081 has 8 divisors (see below), whose sum is σ = 28552390440. Its totient is φ = 28295036928.

The previous prime is 28423643077. The next prime is 28423643167. The reversal of 28423643081 is 18034632482.

It can be written as a sum of positive squares in 4 ways, for example, as 18559975225 + 9863667856 = 136235^2 + 99316^2 .

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 28423643081 - 2² = 28423643077 is a prime.

It is a super-2 number, since 2×28423643081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28423643681) 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, 379145 + ... + 447881.

It is an arithmetic number, because the mean of its divisors is an integer number (3569048805).

Almost surely, 2^28423643081 is an apocalyptic number.

It is an amenable number.

28423643081 is a deficient number, since it is larger than the sum of its proper divisors (128747359).

28423643081 is a wasteful number, since it uses less digits than its factorization.

28423643081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70603.

The product of its (nonzero) digits is 221184, while the sum is 41.

The spelling of 28423643081 in words is "twenty-eight billion, four hundred twenty-three million, six hundred forty-three thousand, eighty-one".