28323701280 has 864 divisors, whose sum is σ = 121764202560. Its totient is φ = 5957038080.

The previous prime is 28323701267. The next prime is 28323701291. The reversal of 28323701280 is 8210732382.

It is a happy number.

28323701280 is a `hidden beast` number, since 2 + 8 + 3 + 2 + 370 + 1 + 280 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 49603395 + ... + 49603965.

It is an arithmetic number, because the mean of its divisors is an integer number (140930790).

Almost surely, 2^28323701280 is an apocalyptic number.

28323701280 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 28323701280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60882101280).

28323701280 is an abundant number, since it is smaller than the sum of its proper divisors (93440501280).

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

28323701280 is a wasteful number, since it uses less digits than its factorization.

28323701280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 28323701280 in words is "twenty-eight billion, three hundred twenty-three million, seven hundred one thousand, two hundred eighty".