28021022870406 has 16 divisors (see below), whose sum is σ = 56042223872304. Its totient is φ = 9340311268224.

The previous prime is 28021022870383. The next prime is 28021022870459. The reversal of 28021022870406 is 60407822012082.

It is a super-2 number, since 2×28021022870406² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5331895 + ... + 9190818.

It is an arithmetic number, because the mean of its divisors is an integer number (3502638992019).

Almost surely, 2^{28021022870406} is an apocalyptic number.

28021022870406 is an abundant number, since it is smaller than the sum of its proper divisors (28021201001898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28021022870406 is a wasteful number, since it uses less digits than its factorization.

28021022870406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14844295.

The product of its (nonzero) digits is 172032, while the sum is 42.

Adding to 28021022870406 its reverse (60407822012082), we get a palindrome (88428844882488).

The spelling of 28021022870406 in words is "twenty-eight trillion, twenty-one billion, twenty-two million, eight hundred seventy thousand, four hundred six".