28621717156 has 24 divisors (see below), whose sum is σ = 51950545920. Its totient is φ = 13781282592.

The previous prime is 28621717099. The next prime is 28621717207. The reversal of 28621717156 is 65171712682.

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, 277686 + ... + 366541.

It is an arithmetic number, because the mean of its divisors is an integer number (2164606080).

Almost surely, 2^28621717156 is an apocalyptic number.

It is an amenable number.

28621717156 is a deficient number, since it is larger than the sum of its proper divisors (23328828764).

28621717156 is a wasteful number, since it uses less digits than its factorization.

28621717156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644643 (or 644641 counting only the distinct ones).

The product of its digits is 282240, while the sum is 46.

The spelling of 28621717156 in words is "twenty-eight billion, six hundred twenty-one million, seven hundred seventeen thousand, one hundred fifty-six".