28865571552431 has 2 divisors, whose sum is σ = 28865571552432. Its totient is φ = 28865571552430.

The previous prime is 28865571552409. The next prime is 28865571552469. The reversal of 28865571552431 is 13425517556882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28865571552431 - 2¹⁰ = 28865571551407 is a prime.

It is a super-2 number, since 2×28865571552431² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28865571552731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14432785776215 + 14432785776216.

It is an arithmetic number, because the mean of its divisors is an integer number (14432785776216).

Almost surely, 2^{28865571552431} is an apocalyptic number.

28865571552431 is a deficient number, since it is larger than the sum of its proper divisors (1).

28865571552431 is an equidigital number, since it uses as much as digits as its factorization.

28865571552431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640000, while the sum is 62.

The spelling of 28865571552431 in words is "twenty-eight trillion, eight hundred sixty-five billion, five hundred seventy-one million, five hundred fifty-two thousand, four hundred thirty-one".