28057728487 has 2 divisors, whose sum is σ = 28057728488. Its totient is φ = 28057728486.

The previous prime is 28057728467. The next prime is 28057728499. The reversal of 28057728487 is 78482775082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28057728487 - 2³¹ = 25910244839 is a prime.

It is a super-2 number, since 2×28057728487² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 14028864243 + 14028864244.

It is an arithmetic number, because the mean of its divisors is an integer number (14028864244).

Almost surely, 2^28057728487 is an apocalyptic number.

28057728487 is a deficient number, since it is larger than the sum of its proper divisors (1).

28057728487 is an equidigital number, since it uses as much as digits as its factorization.

28057728487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14049280, while the sum is 58.

The spelling of 28057728487 in words is "twenty-eight billion, fifty-seven million, seven hundred twenty-eight thousand, four hundred eighty-seven".