28252394381 has 2 divisors, whose sum is σ = 28252394382. Its totient is φ = 28252394380.

The previous prime is 28252394351. The next prime is 28252394441. The reversal of 28252394381 is 18349325282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18641533156 + 9610861225 = 136534^2 + 98035^2 .

It is a cyclic number.

It is not a de Polignac number, because 28252394381 - 2²⁶ = 28185285517 is a prime.

It is a super-2 number, since 2×28252394381² (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 (28252394311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14126197190 + 14126197191.

It is an arithmetic number, because the mean of its divisors is an integer number (14126197191).

Almost surely, 2^28252394381 is an apocalyptic number.

It is an amenable number.

28252394381 is a deficient number, since it is larger than the sum of its proper divisors (1).

28252394381 is an equidigital number, since it uses as much as digits as its factorization.

28252394381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 47.

The spelling of 28252394381 in words is "twenty-eight billion, two hundred fifty-two million, three hundred ninety-four thousand, three hundred eighty-one".