28521251460 has 288 divisors, whose sum is σ = 95618734848. Its totient is φ = 6838041600.

The previous prime is 28521251459. The next prime is 28521251461. The reversal of 28521251460 is 6415212582.

28521251460 is a `hidden beast` number, since 2 + 85 + 2 + 1 + 2 + 514 + 60 = 666.

It is an interprime number because it is at equal distance from previous prime (28521251459) and next prime (28521251461).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28521251461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18726259 + ... + 18727781.

It is an arithmetic number, because the mean of its divisors is an integer number (332009496).

Almost surely, 2^28521251460 is an apocalyptic number.

28521251460 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 28521251460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47809367424).

28521251460 is an abundant number, since it is smaller than the sum of its proper divisors (67097483388).

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

28521251460 is a wasteful number, since it uses less digits than its factorization.

28521251460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755 (or 1750 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 28521251460 in words is "twenty-eight billion, five hundred twenty-one million, two hundred fifty-one thousand, four hundred sixty".