28527621861 has 32 divisors (see below), whose sum is σ = 38985504768. Its totient is φ = 18550911680.

The previous prime is 28527621847. The next prime is 28527621883. The reversal of 28527621861 is 16812672582.

It is a cyclic number.

It is not a de Polignac number, because 28527621861 - 2¹⁰ = 28527620837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28527621861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28527621961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8072851 + ... + 8076383.

It is an arithmetic number, because the mean of its divisors is an integer number (1218297024).

Almost surely, 2^28527621861 is an apocalyptic number.

It is an amenable number.

28527621861 is a deficient number, since it is larger than the sum of its proper divisors (10457882907).

28527621861 is a wasteful number, since it uses less digits than its factorization.

28527621861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001.

The product of its digits is 645120, while the sum is 48.

The spelling of 28527621861 in words is "twenty-eight billion, five hundred twenty-seven million, six hundred twenty-one thousand, eight hundred sixty-one".