28553431500 has 480 divisors, whose sum is σ = 102745843200. Its totient is φ = 6845904000.

The previous prime is 28553431469. The next prime is 28553431537. The reversal of 28553431500 is 513435582.

28553431500 is a `hidden beast` number, since 28 + 553 + 4 + 31 + 50 + 0 = 666.

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

It is an unprimeable number.

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 159 ways as a sum of consecutive naturals, for example, 47668201 + ... + 47668799.

It is an arithmetic number, because the mean of its divisors is an integer number (214053840).

Almost surely, 2^28553431500 is an apocalyptic number.

28553431500 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 28553431500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51372921600).

28553431500 is an abundant number, since it is smaller than the sum of its proper divisors (74192411700).

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

28553431500 is a wasteful number, since it uses less digits than its factorization.

28553431500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748 (or 727 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 28553431500 in words is "twenty-eight billion, five hundred fifty-three million, four hundred thirty-one thousand, five hundred".