78306461 has 2 divisors, whose sum is σ = 78306462. Its totient is φ = 78306460.

The previous prime is 78306457. The next prime is 78306463. The reversal of 78306461 is 16460387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77968900 + 337561 = 8830^2 + 581^2 .

It is a cyclic number.

It is not a de Polignac number, because 78306461 - 2² = 78306457 is a prime.

It is a super-2 number, since 2×78306461² = 12263803668689042, which contains 22 as substring.

Together with 78306463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78306463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39153230 + 39153231.

It is an arithmetic number, because the mean of its divisors is an integer number (39153231).

Almost surely, 2^78306461 is an apocalyptic number.

It is an amenable number.

78306461 is a deficient number, since it is larger than the sum of its proper divisors (1).

78306461 is an equidigital number, since it uses as much as digits as its factorization.

78306461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 78306461 is about 8849.0937954120. The cubic root of 78306461 is about 427.8247109516.

The spelling of 78306461 in words is "seventy-eight million, three hundred six thousand, four hundred sixty-one".