78484657 has 2 divisors, whose sum is σ = 78484658. Its totient is φ = 78484656.

The previous prime is 78484633. The next prime is 78484667. The reversal of 78484657 is 75648487.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72743841 + 5740816 = 8529^2 + 2396^2 .

It is a cyclic number.

It is not a de Polignac number, because 78484657 - 2¹¹ = 78482609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78484657.

It is not a weakly prime, because it can be changed into another prime (78484667) 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, 39242328 + 39242329.

It is an arithmetic number, because the mean of its divisors is an integer number (39242329).

Almost surely, 2^78484657 is an apocalyptic number.

It is an amenable number.

78484657 is a deficient number, since it is larger than the sum of its proper divisors (1).

78484657 is an equidigital number, since it uses as much as digits as its factorization.

78484657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1505280, while the sum is 49.

The square root of 78484657 is about 8859.1566754404. The cubic root of 78484657 is about 428.1489877124.

The spelling of 78484657 in words is "seventy-eight million, four hundred eighty-four thousand, six hundred fifty-seven".