28709520000 has 640 divisors, whose sum is σ = 113795573760. Its totient is φ = 6268416000.

The previous prime is 28709519983. The next prime is 28709520017. The reversal of 28709520000 is 2590782.

It is an interprime number because it is at equal distance from previous prime (28709519983) and next prime (28709520017).

It is a tau number, because it is divible by the number of its divisors (640).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 38639629 + ... + 38640371.

It is an arithmetic number, because the mean of its divisors is an integer number (177805584).

Almost surely, 2^28709520000 is an apocalyptic number.

28709520000 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 28709520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56897786880).

28709520000 is an abundant number, since it is smaller than the sum of its proper divisors (85086053760).

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

28709520000 is an equidigital number, since it uses as much as digits as its factorization.

28709520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 783 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 28709520000 in words is "twenty-eight billion, seven hundred nine million, five hundred twenty thousand".