28545416821 has 16 divisors (see below), whose sum is σ = 30261686400. Its totient is φ = 26851099968.

The previous prime is 28545416819. The next prime is 28545416827. The reversal of 28545416821 is 12861454582.

It is a cyclic number.

It is not a de Polignac number, because 28545416821 - 2¹ = 28545416819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28545416827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1897696 + ... + 1912678.

It is an arithmetic number, because the mean of its divisors is an integer number (1891355400).

Almost surely, 2^28545416821 is an apocalyptic number.

It is an amenable number.

28545416821 is a deficient number, since it is larger than the sum of its proper divisors (1716269579).

28545416821 is a wasteful number, since it uses less digits than its factorization.

28545416821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15708.

The product of its digits is 614400, while the sum is 46.

The spelling of 28545416821 in words is "twenty-eight billion, five hundred forty-five million, four hundred sixteen thousand, eight hundred twenty-one".