78620629 has 2 divisors, whose sum is σ = 78620630. Its totient is φ = 78620628.

The previous prime is 78620617. The next prime is 78620639. The reversal of 78620629 is 92602687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55800900 + 22819729 = 7470^2 + 4777^2 .

It is an emirp because it is prime and its reverse (92602687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78620629 - 2¹⁷ = 78489557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78620591 and 78620600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78620639) 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, 39310314 + 39310315.

It is an arithmetic number, because the mean of its divisors is an integer number (39310315).

Almost surely, 2^78620629 is an apocalyptic number.

It is an amenable number.

78620629 is a deficient number, since it is larger than the sum of its proper divisors (1).

78620629 is an equidigital number, since it uses as much as digits as its factorization.

78620629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 78620629 is about 8866.8274484169. The cubic root of 78620629 is about 428.3960962533.

The spelling of 78620629 in words is "seventy-eight million, six hundred twenty thousand, six hundred twenty-nine".