28057728467 has 2 divisors, whose sum is σ = 28057728468. Its totient is φ = 28057728466.

The previous prime is 28057728449. The next prime is 28057728487. The reversal of 28057728467 is 76482775082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28057728467 - 2¹² = 28057724371 is a prime.

It is a super-2 number, since 2×28057728467² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28057728407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028864233 + 14028864234.

It is an arithmetic number, because the mean of its divisors is an integer number (14028864234).

Almost surely, 2^28057728467 is an apocalyptic number.

28057728467 is a deficient number, since it is larger than the sum of its proper divisors (1).

28057728467 is an equidigital number, since it uses as much as digits as its factorization.

28057728467 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10536960, while the sum is 56.

The spelling of 28057728467 in words is "twenty-eight billion, fifty-seven million, seven hundred twenty-eight thousand, four hundred sixty-seven".