28021266945 has 48 divisors (see below), whose sum is σ = 55618168320. Its totient is φ = 12784482432.

The previous prime is 28021266929. The next prime is 28021266967. The reversal of 28021266945 is 54966212082.

28021266945 is a `hidden beast` number, since 280 + 21 + 266 + 94 + 5 = 666.

It is not a de Polignac number, because 28021266945 - 2⁴ = 28021266929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28021266945.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72952 + ... + 247718.

It is an arithmetic number, because the mean of its divisors is an integer number (1158711840).

Almost surely, 2^28021266945 is an apocalyptic number.

It is an amenable number.

28021266945 is a deficient number, since it is larger than the sum of its proper divisors (27596901375).

28021266945 is a wasteful number, since it uses less digits than its factorization.

28021266945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175294 (or 175291 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 28021266945 in words is "twenty-eight billion, twenty-one million, two hundred sixty-six thousand, nine hundred forty-five".