28996865436 has 216 divisors, whose sum is σ = 89308789248. Its totient is φ = 7288142400.

The previous prime is 28996865393. The next prime is 28996865459. The reversal of 28996865436 is 63456869982.

It is a super-2 number, since 2×28996865436² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2199015 + ... + 2212161.

Almost surely, 2^28996865436 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 28996865436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44654394624).

28996865436 is an abundant number, since it is smaller than the sum of its proper divisors (60311923812).

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

28996865436 is a wasteful number, since it uses less digits than its factorization.

28996865436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13221 (or 13201 counting only the distinct ones).

The product of its digits is 134369280, while the sum is 66.

The spelling of 28996865436 in words is "twenty-eight billion, nine hundred ninety-six million, eight hundred sixty-five thousand, four hundred thirty-six".