28257570641 has 2 divisors, whose sum is σ = 28257570642. Its totient is φ = 28257570640.

The previous prime is 28257570611. The next prime is 28257570673. The reversal of 28257570641 is 14607575282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22976496400 + 5281074241 = 151580^2 + 72671^2 .

It is a cyclic number.

It is not a de Polignac number, because 28257570641 - 2³⁴ = 11077701457 is a prime.

It is a super-2 number, since 2×28257570641² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28257570611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14128785320 + 14128785321.

It is an arithmetic number, because the mean of its divisors is an integer number (14128785321).

Almost surely, 2^28257570641 is an apocalyptic number.

It is an amenable number.

28257570641 is a deficient number, since it is larger than the sum of its proper divisors (1).

28257570641 is an equidigital number, since it uses as much as digits as its factorization.

28257570641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 940800, while the sum is 47.

The spelling of 28257570641 in words is "twenty-eight billion, two hundred fifty-seven million, five hundred seventy thousand, six hundred forty-one".