28601320988 has 12 divisors (see below), whose sum is σ = 50328845112. Its totient is φ = 14221650960.

The previous prime is 28601320981. The next prime is 28601321003. The reversal of 28601320988 is 88902310682.

It is a super-2 number, since 2×28601320988² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28601320981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19751570 + ... + 19753017.

It is an arithmetic number, because the mean of its divisors is an integer number (4194070426).

Almost surely, 2^28601320988 is an apocalyptic number.

It is an amenable number.

28601320988 is a deficient number, since it is larger than the sum of its proper divisors (21727524124).

28601320988 is a wasteful number, since it uses less digits than its factorization.

28601320988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39504772 (or 39504770 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 47.

The spelling of 28601320988 in words is "twenty-eight billion, six hundred one million, three hundred twenty thousand, nine hundred eighty-eight".