28395843840 has 576 divisors, whose sum is σ = 124033190400. Its totient is φ = 5990547456.

The previous prime is 28395843829. The next prime is 28395843859. The reversal of 28395843840 is 4834859382.

28395843840 is a `hidden beast` number, since 2 + 83 + 95 + 8 + 438 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3140446 + ... + 3149474.

It is an arithmetic number, because the mean of its divisors is an integer number (215335400).

Almost surely, 2^28395843840 is an apocalyptic number.

28395843840 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 28395843840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62016595200).

28395843840 is an abundant number, since it is smaller than the sum of its proper divisors (95637346560).

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

28395843840 is a wasteful number, since it uses less digits than its factorization.

28395843840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9079 (or 9059 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 28395843840 in words is "twenty-eight billion, three hundred ninety-five million, eight hundred forty-three thousand, eight hundred forty".