28064461531 has 2 divisors, whose sum is σ = 28064461532. Its totient is φ = 28064461530.

The previous prime is 28064461493. The next prime is 28064461549. The reversal of 28064461531 is 13516446082.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28064461531 is a prime.

It is a super-2 number, since 2×28064461531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28064461331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14032230765 + 14032230766.

It is an arithmetic number, because the mean of its divisors is an integer number (14032230766).

Almost surely, 2^28064461531 is an apocalyptic number.

28064461531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28064461531 is an equidigital number, since it uses as much as digits as its factorization.

28064461531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 28064461531 in words is "twenty-eight billion, sixty-four million, four hundred sixty-one thousand, five hundred thirty-one".