28406772973 has 2 divisors, whose sum is σ = 28406772974. Its totient is φ = 28406772972.

The previous prime is 28406772857. The next prime is 28406773007. The reversal of 28406772973 is 37927760482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24381885609 + 4024887364 = 156147^2 + 63442^2 .

It is a cyclic number.

It is not a de Polignac number, because 28406772973 - 2²⁵ = 28373218541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28406772673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14203386486 + 14203386487.

It is an arithmetic number, because the mean of its divisors is an integer number (14203386487).

Almost surely, 2^28406772973 is an apocalyptic number.

It is an amenable number.

28406772973 is a deficient number, since it is larger than the sum of its proper divisors (1).

28406772973 is an equidigital number, since it uses as much as digits as its factorization.

28406772973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7112448, while the sum is 55.

The spelling of 28406772973 in words is "twenty-eight billion, four hundred six million, seven hundred seventy-two thousand, nine hundred seventy-three".