28900981469 has 2 divisors, whose sum is σ = 28900981470. Its totient is φ = 28900981468.

The previous prime is 28900981433. The next prime is 28900981489. The reversal of 28900981469 is 96418900982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15337584025 + 13563397444 = 123845^2 + 116462^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28900981469 is a prime.

It is a super-2 number, since 2×28900981469² (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 (28900981409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14450490734 + 14450490735.

It is an arithmetic number, because the mean of its divisors is an integer number (14450490735).

Almost surely, 2^28900981469 is an apocalyptic number.

It is an amenable number.

28900981469 is a deficient number, since it is larger than the sum of its proper divisors (1).

28900981469 is an equidigital number, since it uses as much as digits as its factorization.

28900981469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 56.

The spelling of 28900981469 in words is "twenty-eight billion, nine hundred million, nine hundred eighty-one thousand, four hundred sixty-nine".