76668989 has 2 divisors, whose sum is σ = 76668990. Its totient is φ = 76668988.

The previous prime is 76668979. The next prime is 76669001. The reversal of 76668989 is 98986667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42680089 + 33988900 = 6533^2 + 5830^2 .

It is a cyclic number.

It is not a de Polignac number, because 76668989 - 2⁸ = 76668733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76668919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38334494 + 38334495.

It is an arithmetic number, because the mean of its divisors is an integer number (38334495).

Almost surely, 2^76668989 is an apocalyptic number.

It is an amenable number.

76668989 is a deficient number, since it is larger than the sum of its proper divisors (1).

76668989 is an equidigital number, since it uses as much as digits as its factorization.

76668989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 59.

The square root of 76668989 is about 8756.0829712834. The cubic root of 76668989 is about 424.8215887829.

The spelling of 76668989 in words is "seventy-six million, six hundred sixty-eight thousand, nine hundred eighty-nine".