28961257208 has 32 divisors (see below), whose sum is σ = 61022052000. Its totient is φ = 12785570688.

The previous prime is 28961257177. The next prime is 28961257217. The reversal of 28961257208 is 80275216982.

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, 6051383 + ... + 6056166.

It is an arithmetic number, because the mean of its divisors is an integer number (1906939125).

Almost surely, 2^28961257208 is an apocalyptic number.

It is an amenable number.

28961257208 is an abundant number, since it is smaller than the sum of its proper divisors (32060794792).

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

28961257208 is a wasteful number, since it uses less digits than its factorization.

28961257208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12107591 (or 12107587 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 28961257208 in words is "twenty-eight billion, nine hundred sixty-one million, two hundred fifty-seven thousand, two hundred eight".