28396432320 has 224 divisors, whose sum is σ = 91287356160. Its totient is φ = 7478231040.

The previous prime is 28396432319. The next prime is 28396432399. The reversal of 28396432320 is 2323469382.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32158599 + ... + 32159481.

It is an arithmetic number, because the mean of its divisors is an integer number (407532840).

Almost surely, 2^28396432320 is an apocalyptic number.

28396432320 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 28396432320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45643678080).

28396432320 is an abundant number, since it is smaller than the sum of its proper divisors (62890923840).

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

28396432320 is a wasteful number, since it uses less digits than its factorization.

28396432320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283 (or 1273 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 42.

The spelling of 28396432320 in words is "twenty-eight billion, three hundred ninety-six million, four hundred thirty-two thousand, three hundred twenty".