78234259 has 2 divisors, whose sum is σ = 78234260. Its totient is φ = 78234258.

The previous prime is 78234251. The next prime is 78234271. The reversal of 78234259 is 95243287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78234259 - 2³ = 78234251 is a prime.

It is a super-2 number, since 2×78234259² = 12241198562558162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78234251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39117129 + 39117130.

It is an arithmetic number, because the mean of its divisors is an integer number (39117130).

Almost surely, 2^78234259 is an apocalyptic number.

78234259 is a deficient number, since it is larger than the sum of its proper divisors (1).

78234259 is an equidigital number, since it uses as much as digits as its factorization.

78234259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 78234259 is about 8845.0132278024. The cubic root of 78234259 is about 427.6931794527.

Subtracting 78234259 from its reverse (95243287), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 78234259 in words is "seventy-eight million, two hundred thirty-four thousand, two hundred fifty-nine".