78622651 has 2 divisors, whose sum is σ = 78622652. Its totient is φ = 78622650.

The previous prime is 78622573. The next prime is 78622673. The reversal of 78622651 is 15622687.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78622651 - 2¹⁷ = 78491579 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78622651.

It is not a weakly prime, because it can be changed into another prime (78629651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39311325 + 39311326.

It is an arithmetic number, because the mean of its divisors is an integer number (39311326).

Almost surely, 2^78622651 is an apocalyptic number.

78622651 is a deficient number, since it is larger than the sum of its proper divisors (1).

78622651 is an equidigital number, since it uses as much as digits as its factorization.

78622651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 78622651 is about 8866.9414681727. The cubic root of 78622651 is about 428.3997687818.

The spelling of 78622651 in words is "seventy-eight million, six hundred twenty-two thousand, six hundred fifty-one".