78605041 has 2 divisors, whose sum is σ = 78605042. Its totient is φ = 78605040.

The previous prime is 78605039. The next prime is 78605069. The reversal of 78605041 is 14050687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72335025 + 6270016 = 8505^2 + 2504^2 .

It is a cyclic number.

It is not a de Polignac number, because 78605041 - 2¹ = 78605039 is a prime.

It is a super-2 number, since 2×78605041² = 12357504941223362, which contains 22 as substring.

Together with 78605039, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 78604994 and 78605012.

It is not a weakly prime, because it can be changed into another prime (78605081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39302520 + 39302521.

It is an arithmetic number, because the mean of its divisors is an integer number (39302521).

Almost surely, 2^78605041 is an apocalyptic number.

It is an amenable number.

78605041 is a deficient number, since it is larger than the sum of its proper divisors (1).

78605041 is an equidigital number, since it uses as much as digits as its factorization.

78605041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 78605041 is about 8865.9483982257. The cubic root of 78605041 is about 428.3677818876.

The spelling of 78605041 in words is "seventy-eight million, six hundred five thousand, forty-one".