78627551 has 2 divisors, whose sum is σ = 78627552. Its totient is φ = 78627550.

The previous prime is 78627541. The next prime is 78627557. The reversal of 78627551 is 15572687.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78627551 - 2²⁶ = 11518687 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78627499 and 78627508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78627557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39313775 + 39313776.

It is an arithmetic number, because the mean of its divisors is an integer number (39313776).

Almost surely, 2^78627551 is an apocalyptic number.

78627551 is a deficient number, since it is larger than the sum of its proper divisors (1).

78627551 is an equidigital number, since it uses as much as digits as its factorization.

78627551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 41.

The square root of 78627551 is about 8867.2177710937. The cubic root of 78627551 is about 428.4086683174.

The spelling of 78627551 in words is "seventy-eight million, six hundred twenty-seven thousand, five hundred fifty-one".