28521979200 has 1512 divisors, whose sum is σ = 130179897120. Its totient is φ = 6046617600.

The previous prime is 28521979153. The next prime is 28521979217. The reversal of 28521979200 is 297912582.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 1501156791 + ... + 1501156809.

Almost surely, 2^28521979200 is an apocalyptic number.

28521979200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28521979200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65089948560).

28521979200 is an abundant number, since it is smaller than the sum of its proper divisors (101657917920).

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

28521979200 is a wasteful number, since it uses less digits than its factorization.

28521979200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 28521979200 in words is "twenty-eight billion, five hundred twenty-one million, nine hundred seventy-nine thousand, two hundred".