28227447657 has 12 divisors (see below), whose sum is σ = 41066312560. Its totient is φ = 18682914168.

The previous prime is 28227447643. The next prime is 28227447697. The reversal of 28227447657 is 75674472282.

28227447657 is a `hidden beast` number, since 282 + 274 + 47 + 6 + 57 = 666.

It is not a de Polignac number, because 28227447657 - 2¹⁰ = 28227446633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28227447697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11280703 + ... + 11283204.

Almost surely, 2^28227447657 is an apocalyptic number.

It is an amenable number.

28227447657 is a deficient number, since it is larger than the sum of its proper divisors (12838864903).

28227447657 is a wasteful number, since it uses less digits than its factorization.

28227447657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22564052 (or 22564049 counting only the distinct ones).

The product of its digits is 10536960, while the sum is 54.

The spelling of 28227447657 in words is "twenty-eight billion, two hundred twenty-seven million, four hundred forty-seven thousand, six hundred fifty-seven".