28720549152 has 36 divisors (see below), whose sum is σ = 81674062470. Its totient is φ = 9573516288.

The previous prime is 28720549103. The next prime is 28720549219. The reversal of 28720549152 is 25194502782.

28720549152 is a `hidden beast` number, since 2 + 87 + 20 + 549 + 1 + 5 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 24950097936 + 3770451216 = 157956^2 + 61404^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 28720549098 and 28720549107.

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 5 ways as a sum of consecutive naturals, for example, 49861777 + ... + 49862352.

Almost surely, 2^28720549152 is an apocalyptic number.

It is an amenable number.

28720549152 is an abundant number, since it is smaller than the sum of its proper divisors (52953513318).

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

28720549152 is a wasteful number, since it uses less digits than its factorization.

28720549152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99724145 (or 99724134 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 28720549152 in words is "twenty-eight billion, seven hundred twenty million, five hundred forty-nine thousand, one hundred fifty-two".