28351088640 has 960 divisors, whose sum is σ = 122724201600. Its totient is φ = 6115295232.

The previous prime is 28351088593. The next prime is 28351088677. The reversal of 28351088640 is 4688015382.

It is a tau number, because it is divible by the number of its divisors (960).

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 79 ways as a sum of consecutive naturals, for example, 110315392 + ... + 110315648.

It is an arithmetic number, because the mean of its divisors is an integer number (127837710).

Almost surely, 2^28351088640 is an apocalyptic number.

28351088640 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 28351088640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61362100800).

28351088640 is an abundant number, since it is smaller than the sum of its proper divisors (94373112960).

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

28351088640 is a wasteful number, since it uses less digits than its factorization.

28351088640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 28351088640 in words is "twenty-eight billion, three hundred fifty-one million, eighty-eight thousand, six hundred forty".