78450451 has 2 divisors, whose sum is σ = 78450452. Its totient is φ = 78450450.

The previous prime is 78450443. The next prime is 78450469. The reversal of 78450451 is 15405487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78450451 - 2³ = 78450443 is a prime.

It is not a weakly prime, because it can be changed into another prime (78450551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39225225 + 39225226.

It is an arithmetic number, because the mean of its divisors is an integer number (39225226).

Almost surely, 2^78450451 is an apocalyptic number.

78450451 is a deficient number, since it is larger than the sum of its proper divisors (1).

78450451 is an equidigital number, since it uses as much as digits as its factorization.

78450451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 78450451 is about 8857.2259201174. The cubic root of 78450451 is about 428.0867785581.

The spelling of 78450451 in words is "seventy-eight million, four hundred fifty thousand, four hundred fifty-one".