28000450388531 has 2 divisors, whose sum is σ = 28000450388532. Its totient is φ = 28000450388530.

The previous prime is 28000450388513. The next prime is 28000450388587. The reversal of 28000450388531 is 13588305400082.

Together with previous prime (28000450388513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28000450388531 - 2¹⁸ = 28000450126387 is a prime.

It is a super-2 number, since 2×28000450388531² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28000450088531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14000225194265 + 14000225194266.

It is an arithmetic number, because the mean of its divisors is an integer number (14000225194266).

Almost surely, 2^{28000450388531} is an apocalyptic number.

28000450388531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28000450388531 is an equidigital number, since it uses as much as digits as its factorization.

28000450388531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 921600, while the sum is 47.

The spelling of 28000450388531 in words is "twenty-eight trillion, four hundred fifty million, three hundred eighty-eight thousand, five hundred thirty-one".