78734413 has 2 divisors, whose sum is σ = 78734414. Its totient is φ = 78734412.

The previous prime is 78734407. The next prime is 78734437. The reversal of 78734413 is 31443787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71859529 + 6874884 = 8477^2 + 2622^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78734413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78734213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39367206 + 39367207.

It is an arithmetic number, because the mean of its divisors is an integer number (39367207).

Almost surely, 2^78734413 is an apocalyptic number.

It is an amenable number.

78734413 is a deficient number, since it is larger than the sum of its proper divisors (1).

78734413 is an equidigital number, since it uses as much as digits as its factorization.

78734413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 37.

The square root of 78734413 is about 8873.2414032303. The cubic root of 78734413 is about 428.6026625861.

The spelling of 78734413 in words is "seventy-eight million, seven hundred thirty-four thousand, four hundred thirteen".