28563971612 has 24 divisors (see below), whose sum is σ = 54543482112. Its totient is φ = 12980703600.

The previous prime is 28563971599. The next prime is 28563971627. The reversal of 28563971612 is 21617936582.

It is a happy number.

It is a super-2 number, since 2×28563971612² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131303 + ... + 272705.

It is an arithmetic number, because the mean of its divisors is an integer number (2272645088).

Almost surely, 2^28563971612 is an apocalyptic number.

28563971612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28563971612 is a deficient number, since it is larger than the sum of its proper divisors (25979510500).

28563971612 is a wasteful number, since it uses less digits than its factorization.

28563971612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146009 (or 146007 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 50.

The spelling of 28563971612 in words is "twenty-eight billion, five hundred sixty-three million, nine hundred seventy-one thousand, six hundred twelve".