78766481 has 2 divisors, whose sum is σ = 78766482. Its totient is φ = 78766480.

The previous prime is 78766439. The next prime is 78766507. The reversal of 78766481 is 18466787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 13075456 = 8105^2 + 3616^2 .

It is a cyclic number.

It is not a de Polignac number, because 78766481 - 2⁶ = 78766417 is a prime.

It is a super-2 number, since 2×78766481² = 12408317058246722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78763481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39383240 + 39383241.

It is an arithmetic number, because the mean of its divisors is an integer number (39383241).

Almost surely, 2^78766481 is an apocalyptic number.

It is an amenable number.

78766481 is a deficient number, since it is larger than the sum of its proper divisors (1).

78766481 is an equidigital number, since it uses as much as digits as its factorization.

78766481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 47.

The square root of 78766481 is about 8875.0482252211. The cubic root of 78766481 is about 428.6608436875.

The spelling of 78766481 in words is "seventy-eight million, seven hundred sixty-six thousand, four hundred eighty-one".