78349259 has 2 divisors, whose sum is σ = 78349260. Its totient is φ = 78349258.

The previous prime is 78349253. The next prime is 78349273. The reversal of 78349259 is 95294387.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78349259 is a prime.

It is a super-2 number, since 2×78349259² = 12277212771698162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78349253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39174629 + 39174630.

It is an arithmetic number, because the mean of its divisors is an integer number (39174630).

Almost surely, 2^78349259 is an apocalyptic number.

78349259 is a deficient number, since it is larger than the sum of its proper divisors (1).

78349259 is an equidigital number, since it uses as much as digits as its factorization.

78349259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 78349259 is about 8851.5116788038. The cubic root of 78349259 is about 427.9026385666.

The spelling of 78349259 in words is "seventy-eight million, three hundred forty-nine thousand, two hundred fifty-nine".