78570641 has 2 divisors, whose sum is σ = 78570642. Its totient is φ = 78570640.

The previous prime is 78570601. The next prime is 78570649. The reversal of 78570641 is 14607587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47210641 + 31360000 = 6871^2 + 5600^2 .

It is an emirp because it is prime and its reverse (14607587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78570641 - 2⁶ = 78570577 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78570595 and 78570604.

It is not a weakly prime, because it can be changed into another prime (78570649) 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, 39285320 + 39285321.

It is an arithmetic number, because the mean of its divisors is an integer number (39285321).

Almost surely, 2^78570641 is an apocalyptic number.

It is an amenable number.

78570641 is a deficient number, since it is larger than the sum of its proper divisors (1).

78570641 is an equidigital number, since it uses as much as digits as its factorization.

78570641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 78570641 is about 8864.0081791479. The cubic root of 78570641 is about 428.3052837677.

The spelling of 78570641 in words is "seventy-eight million, five hundred seventy thousand, six hundred forty-one".