77830481 has 2 divisors, whose sum is σ = 77830482. Its totient is φ = 77830480.

The previous prime is 77830427. The next prime is 77830541. The reversal of 77830481 is 18403877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43020481 + 34810000 = 6559^2 + 5900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77830481 is a prime.

It is a super-2 number, since 2×77830481² = 12115167545382722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (77830421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38915240 + 38915241.

It is an arithmetic number, because the mean of its divisors is an integer number (38915241).

Almost surely, 2^77830481 is an apocalyptic number.

It is an amenable number.

77830481 is a deficient number, since it is larger than the sum of its proper divisors (1).

77830481 is an equidigital number, since it uses as much as digits as its factorization.

77830481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 77830481 is about 8822.1585227199. The cubic root of 77830481 is about 426.9561151052.

The spelling of 77830481 in words is "seventy-seven million, eight hundred thirty thousand, four hundred eighty-one".