28628379617 has 2 divisors, whose sum is σ = 28628379618. Its totient is φ = 28628379616.

The previous prime is 28628379569. The next prime is 28628379623. The reversal of 28628379617 is 71697382682.

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., 21639586816 + 6988792801 = 147104^2 + 83599^2 .

It is a cyclic number.

It is not a de Polignac number, because 28628379617 - 2⁶ = 28628379553 is a prime.

It is a super-2 number, since 2×28628379617² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28628379677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14314189808 + 14314189809.

It is an arithmetic number, because the mean of its divisors is an integer number (14314189809).

Almost surely, 2^28628379617 is an apocalyptic number.

It is an amenable number.

28628379617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28628379617 is an equidigital number, since it uses as much as digits as its factorization.

28628379617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 59.

The spelling of 28628379617 in words is "twenty-eight billion, six hundred twenty-eight million, three hundred seventy-nine thousand, six hundred seventeen".