28025979966 has 32 divisors (see below), whose sum is σ = 63963202080. Its totient is φ = 9089506368.

The previous prime is 28025979911. The next prime is 28025980043. The reversal of 28025979966 is 66997952082.

It is a super-2 number, since 2×28025979966² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7011511 + ... + 7015506.

It is an arithmetic number, because the mean of its divisors is an integer number (1998850065).

Almost surely, 2^28025979966 is an apocalyptic number.

28025979966 is an abundant number, since it is smaller than the sum of its proper divisors (35937222114).

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

28025979966 is a wasteful number, since it uses less digits than its factorization.

28025979966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14027065 (or 14027059 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 28025979966 in words is "twenty-eight billion, twenty-five million, nine hundred seventy-nine thousand, nine hundred sixty-six".