76818809 has 2 divisors, whose sum is σ = 76818810. Its totient is φ = 76818808.

The previous prime is 76818773. The next prime is 76818839. The reversal of 76818809 is 90881867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53509225 + 23309584 = 7315^2 + 4828^2 .

It is an emirp because it is prime and its reverse (90881867) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76818809 - 2¹² = 76814713 is a prime.

It is a super-2 number, since 2×76818809² = 11802258832356962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76818839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38409404 + 38409405.

It is an arithmetic number, because the mean of its divisors is an integer number (38409405).

Almost surely, 2^76818809 is an apocalyptic number.

It is an amenable number.

76818809 is a deficient number, since it is larger than the sum of its proper divisors (1).

76818809 is an equidigital number, since it uses as much as digits as its factorization.

76818809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 76818809 is about 8764.6339912172. The cubic root of 76818809 is about 425.0981254396.

The spelling of 76818809 in words is "seventy-six million, eight hundred eighteen thousand, eight hundred nine".