8388728129 has 2 divisors, whose sum is σ = 8388728130. Its totient is φ = 8388728128.

The previous prime is 8388728083. The next prime is 8388728191. The reversal of 8388728129 is 9218278838.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6361657600 + 2027070529 = 79760^2 + 45023^2 .

It is a cyclic number.

It is not a de Polignac number, because 8388728129 - 2¹⁶ = 8388662593 is a prime.

It is not a weakly prime, because it can be changed into another prime (8388728629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4194364064 + 4194364065.

It is an arithmetic number, because the mean of its divisors is an integer number (4194364065).

Almost surely, 2^8388728129 is an apocalyptic number.

It is an amenable number.

8388728129 is a deficient number, since it is larger than the sum of its proper divisors (1).

8388728129 is an equidigital number, since it uses as much as digits as its factorization.

8388728129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3096576, while the sum is 56.

The square root of 8388728129 is about 91590.0001583142. Note that the first 3 decimals coincide. The cubic root of 8388728129 is about 2031.8830456155.

The spelling of 8388728129 in words is "eight billion, three hundred eighty-eight million, seven hundred twenty-eight thousand, one hundred twenty-nine".