28527621785 has 32 divisors (see below), whose sum is σ = 38026104480. Its totient is φ = 20408813568.

The previous prime is 28527621779. The next prime is 28527621799. The reversal of 28527621785 is 58712672582.

It can be written as a sum of positive squares in 16 ways, for example, as 12033870601 + 16493751184 = 109699^2 + 128428^2 .

It is not a de Polignac number, because 28527621785 - 2¹² = 28527617689 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 534911 + ... + 585819.

It is an arithmetic number, because the mean of its divisors is an integer number (1188315765).

Almost surely, 2^28527621785 is an apocalyptic number.

It is an amenable number.

28527621785 is a deficient number, since it is larger than the sum of its proper divisors (9498482695).

28527621785 is a wasteful number, since it uses less digits than its factorization.

28527621785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51197.

The product of its digits is 3763200, while the sum is 53.

The spelling of 28527621785 in words is "twenty-eight billion, five hundred twenty-seven million, six hundred twenty-one thousand, seven hundred eighty-five".