28715975280 has 320 divisors, whose sum is σ = 106936012800. Its totient is φ = 7058119680.

The previous prime is 28715975279. The next prime is 28715975291. The reversal of 28715975280 is 8257951782.

28715975280 is a `hidden beast` number, since 28 + 7 + 1 + 5 + 97 + 528 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1509025 + ... + 1527935.

It is an arithmetic number, because the mean of its divisors is an integer number (334175040).

Almost surely, 2^28715975280 is an apocalyptic number.

28715975280 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 28715975280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53468006400).

28715975280 is an abundant number, since it is smaller than the sum of its proper divisors (78220037520).

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

28715975280 is a wasteful number, since it uses less digits than its factorization.

28715975280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18989 (or 18977 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 54.

The spelling of 28715975280 in words is "twenty-eight billion, seven hundred fifteen million, nine hundred seventy-five thousand, two hundred eighty".