28458764861 has 2 divisors, whose sum is σ = 28458764862. Its totient is φ = 28458764860.

The previous prime is 28458764837. The next prime is 28458764923. The reversal of 28458764861 is 16846785482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28356876025 + 101888836 = 168395^2 + 10094^2 .

It is a cyclic number.

It is not a de Polignac number, because 28458764861 - 2³⁰ = 27385023037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28458764861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28458764821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14229382430 + 14229382431.

It is an arithmetic number, because the mean of its divisors is an integer number (14229382431).

Almost surely, 2^28458764861 is an apocalyptic number.

It is an amenable number.

28458764861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28458764861 is an equidigital number, since it uses as much as digits as its factorization.

28458764861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20643840, while the sum is 59.

The spelling of 28458764861 in words is "twenty-eight billion, four hundred fifty-eight million, seven hundred sixty-four thousand, eight hundred sixty-one".