28913936508 has 72 divisors (see below), whose sum is σ = 77000378000. Its totient is φ = 9122927616.

The previous prime is 28913936507. The next prime is 28913936509. The reversal of 28913936508 is 80563931982.

It is an interprime number because it is at equal distance from previous prime (28913936507) and next prime (28913936509).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28913936501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 812268 + ... + 847116.

Almost surely, 2^28913936508 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28913936508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38500189000).

28913936508 is an abundant number, since it is smaller than the sum of its proper divisors (48086441492).

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

28913936508 is a wasteful number, since it uses less digits than its factorization.

28913936508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36091 (or 36086 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 28913936508 in words is "twenty-eight billion, nine hundred thirteen million, nine hundred thirty-six thousand, five hundred eight".