78708601 has 2 divisors, whose sum is σ = 78708602. Its totient is φ = 78708600.

The previous prime is 78708577. The next prime is 78708607. The reversal of 78708601 is 10680787.

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., 65999376 + 12709225 = 8124^2 + 3565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78708601 is a prime.

It is not a weakly prime, because it can be changed into another prime (78708607) 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, 39354300 + 39354301.

It is an arithmetic number, because the mean of its divisors is an integer number (39354301).

Almost surely, 2^78708601 is an apocalyptic number.

It is an amenable number.

78708601 is a deficient number, since it is larger than the sum of its proper divisors (1).

78708601 is an equidigital number, since it uses as much as digits as its factorization.

78708601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 78708601 is about 8871.7867986105. The cubic root of 78708601 is about 428.5558202940. Note that the first 3 decimals are identical.

It can be divided in two parts, 7870 and 8601, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 78708601 in words is "seventy-eight million, seven hundred eight thousand, six hundred one".