78133613 has 2 divisors, whose sum is σ = 78133614. Its totient is φ = 78133612.

The previous prime is 78133589. The next prime is 78133639. The reversal of 78133613 is 31633187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44063044 + 34070569 = 6638^2 + 5837^2 .

It is a cyclic number.

It is not a de Polignac number, because 78133613 - 2⁸ = 78133357 is a prime.

It is a super-2 number, since 2×78133613² = 12209722960867538, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78133613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78133673) 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, 39066806 + 39066807.

It is an arithmetic number, because the mean of its divisors is an integer number (39066807).

Almost surely, 2^78133613 is an apocalyptic number.

It is an amenable number.

78133613 is a deficient number, since it is larger than the sum of its proper divisors (1).

78133613 is an equidigital number, since it uses as much as digits as its factorization.

78133613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 78133613 is about 8839.3219762604. The cubic root of 78133613 is about 427.5096959829.

The spelling of 78133613 in words is "seventy-eight million, one hundred thirty-three thousand, six hundred thirteen".