76725809 has 2 divisors, whose sum is σ = 76725810. Its totient is φ = 76725808.

The previous prime is 76725797. The next prime is 76725823. The reversal of 76725809 is 90852767.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64754209 + 11971600 = 8047^2 + 3460^2 .

It is a cyclic number.

It is not a de Polignac number, because 76725809 - 2²⁰ = 75677233 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76725809.

It is not a weakly prime, because it can be changed into another prime (76721809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38362904 + 38362905.

It is an arithmetic number, because the mean of its divisors is an integer number (38362905).

Almost surely, 2^76725809 is an apocalyptic number.

It is an amenable number.

76725809 is a deficient number, since it is larger than the sum of its proper divisors (1).

76725809 is an equidigital number, since it uses as much as digits as its factorization.

76725809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 76725809 is about 8759.3269718626. The cubic root of 76725809 is about 424.9265090920.

The spelling of 76725809 in words is "seventy-six million, seven hundred twenty-five thousand, eight hundred nine".