78674551 has 2 divisors, whose sum is σ = 78674552. Its totient is φ = 78674550.

The previous prime is 78674537. The next prime is 78674581. The reversal of 78674551 is 15547687.

It is a weak prime.

It is an emirp because it is prime and its reverse (15547687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78674551 - 2⁷ = 78674423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78674498 and 78674507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78674501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39337275 + 39337276.

It is an arithmetic number, because the mean of its divisors is an integer number (39337276).

Almost surely, 2^78674551 is an apocalyptic number.

78674551 is a deficient number, since it is larger than the sum of its proper divisors (1).

78674551 is an equidigital number, since it uses as much as digits as its factorization.

78674551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 235200, while the sum is 43.

The square root of 78674551 is about 8869.8675863848. The cubic root of 78674551 is about 428.4940124346.

The spelling of 78674551 in words is "seventy-eight million, six hundred seventy-four thousand, five hundred fifty-one".