28628780489 has 2 divisors, whose sum is σ = 28628780490. Its totient is φ = 28628780488.

The previous prime is 28628780471. The next prime is 28628780503. The reversal of 28628780489 is 98408782682.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25389235600 + 3239544889 = 159340^2 + 56917^2 .

It is a cyclic number.

It is not a de Polignac number, because 28628780489 - 2¹⁶ = 28628714953 is a prime.

It is not a weakly prime, because it can be changed into another prime (28628780189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14314390244 + 14314390245.

It is an arithmetic number, because the mean of its divisors is an integer number (14314390245).

Almost surely, 2^28628780489 is an apocalyptic number.

It is an amenable number.

28628780489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28628780489 is an equidigital number, since it uses as much as digits as its factorization.

28628780489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24772608, while the sum is 62.

The spelling of 28628780489 in words is "twenty-eight billion, six hundred twenty-eight million, seven hundred eighty thousand, four hundred eighty-nine".