78234529 has 2 divisors, whose sum is σ = 78234530. Its totient is φ = 78234528.

The previous prime is 78234517. The next prime is 78234581. The reversal of 78234529 is 92543287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54420129 + 23814400 = 7377^2 + 4880^2 .

It is an emirp because it is prime and its reverse (92543287) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78234529 is a prime.

It is a super-2 number, since 2×78234529² = 12241283055703682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78234491 and 78234500.

It is not a weakly prime, because it can be changed into another prime (78234589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39117264 + 39117265.

It is an arithmetic number, because the mean of its divisors is an integer number (39117265).

Almost surely, 2^78234529 is an apocalyptic number.

It is an amenable number.

78234529 is a deficient number, since it is larger than the sum of its proper divisors (1).

78234529 is an equidigital number, since it uses as much as digits as its factorization.

78234529 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 78234529 is about 8845.0284906268. The cubic root of 78234529 is about 427.6936714666.

The spelling of 78234529 in words is "seventy-eight million, two hundred thirty-four thousand, five hundred twenty-nine".