78414529 has 2 divisors, whose sum is σ = 78414530. Its totient is φ = 78414528.

The previous prime is 78414527. The next prime is 78414533. The reversal of 78414529 is 92541487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52128400 + 26286129 = 7220^2 + 5127^2 .

It is an emirp because it is prime and its reverse (92541487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78414529 - 2¹ = 78414527 is a prime.

It is a super-2 number, since 2×78414529² = 12297676716583682, which contains 22 as substring.

Together with 78414527, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 78414491 and 78414500.

It is not a weakly prime, because it can be changed into another prime (78414527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39207264 + 39207265.

It is an arithmetic number, because the mean of its divisors is an integer number (39207265).

Almost surely, 2^78414529 is an apocalyptic number.

It is an amenable number.

78414529 is a deficient number, since it is larger than the sum of its proper divisors (1).

78414529 is an equidigital number, since it uses as much as digits as its factorization.

78414529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 78414529 is about 8855.1978521092. The cubic root of 78414529 is about 428.0214291102.

The spelling of 78414529 in words is "seventy-eight million, four hundred fourteen thousand, five hundred twenty-nine".