28016677821 has 32 divisors (see below), whose sum is σ = 43512302592. Its totient is φ = 15863823360.

The previous prime is 28016677813. The next prime is 28016677823. The reversal of 28016677821 is 12877661082.

It is not a de Polignac number, because 28016677821 - 2³ = 28016677813 is a prime.

It is a super-2 number, since 2×28016677821² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28016677823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 396580 + ... + 461853.

It is an arithmetic number, because the mean of its divisors is an integer number (1359759456).

Almost surely, 2^28016677821 is an apocalyptic number.

It is an amenable number.

28016677821 is a deficient number, since it is larger than the sum of its proper divisors (15495624771).

28016677821 is a wasteful number, since it uses less digits than its factorization.

28016677821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858513.

The product of its (nonzero) digits is 451584, while the sum is 48.

The spelling of 28016677821 in words is "twenty-eight billion, sixteen million, six hundred seventy-seven thousand, eight hundred twenty-one".