28319325840 has 320 divisors, whose sum is σ = 108439726080. Its totient is φ = 6745835520.

The previous prime is 28319325791. The next prime is 28319325847. The reversal of 28319325840 is 4852391382.

28319325840 is a `hidden beast` number, since 2 + 8 + 31 + 9 + 32 + 584 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (28319325847) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 854214 + ... + 886746.

It is an arithmetic number, because the mean of its divisors is an integer number (338874144).

Almost surely, 2^28319325840 is an apocalyptic number.

28319325840 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 28319325840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54219863040).

28319325840 is an abundant number, since it is smaller than the sum of its proper divisors (80120400240).

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

28319325840 is a wasteful number, since it uses less digits than its factorization.

28319325840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32599 (or 32587 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 28319325840 in words is "twenty-eight billion, three hundred nineteen million, three hundred twenty-five thousand, eight hundred forty".