28897821665 has 8 divisors (see below), whose sum is σ = 34681124160. Its totient is φ = 23115765232.

The previous prime is 28897821619. The next prime is 28897821703. The reversal of 28897821665 is 56612879882.

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 28897821665 - 2¹⁰ = 28897820641 is a prime.

It is a super-3 number, since 3×28897821665³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28897821598 and 28897821607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259709 + ... + 353898.

It is an arithmetic number, because the mean of its divisors is an integer number (4335140520).

Almost surely, 2^28897821665 is an apocalyptic number.

It is an amenable number.

28897821665 is a deficient number, since it is larger than the sum of its proper divisors (5783302495).

28897821665 is an equidigital number, since it uses as much as digits as its factorization.

28897821665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623031.

The product of its digits is 23224320, while the sum is 62.

The spelling of 28897821665 in words is "twenty-eight billion, eight hundred ninety-seven million, eight hundred twenty-one thousand, six hundred sixty-five".