78788441 has 2 divisors, whose sum is σ = 78788442. Its totient is φ = 78788440.

The previous prime is 78788431. The next prime is 78788467. The reversal of 78788441 is 14488787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46526041 + 32262400 = 6821^2 + 5680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78788441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78788401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39394220 + 39394221.

It is an arithmetic number, because the mean of its divisors is an integer number (39394221).

Almost surely, 2^78788441 is an apocalyptic number.

It is an amenable number.

78788441 is a deficient number, since it is larger than the sum of its proper divisors (1).

78788441 is an equidigital number, since it uses as much as digits as its factorization.

78788441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 401408, while the sum is 47.

The square root of 78788441 is about 8876.2853153783. The cubic root of 78788441 is about 428.7006766948.

The spelling of 78788441 in words is "seventy-eight million, seven hundred eighty-eight thousand, four hundred forty-one".