28347542784 has 720 divisors, whose sum is σ = 100670760960. Its totient is φ = 7838208000.

The previous prime is 28347542777. The next prime is 28347542887. The reversal of 28347542784 is 48724574382.

28347542784 is a `hidden beast` number, since 28 + 3 + 4 + 7 + 542 + 78 + 4 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28347542784.

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, 134348439 + ... + 134348649.

Almost surely, 2^28347542784 is an apocalyptic number.

28347542784 is a gapful number since it is divisible by the number (24) 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 28347542784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50335380480).

28347542784 is an abundant number, since it is smaller than the sum of its proper divisors (72323218176).

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

28347542784 is a wasteful number, since it uses less digits than its factorization.

28347542784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 277 counting only the distinct ones).

The product of its digits is 12042240, while the sum is 54.

The spelling of 28347542784 in words is "twenty-eight billion, three hundred forty-seven million, five hundred forty-two thousand, seven hundred eighty-four".