78382729 has 2 divisors, whose sum is σ = 78382730. Its totient is φ = 78382728.

The previous prime is 78382727. The next prime is 78382751. The reversal of 78382729 is 92728387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76825225 + 1557504 = 8765^2 + 1248^2 .

It is a cyclic number.

It is not a de Polignac number, because 78382729 - 2¹ = 78382727 is a prime.

It is a super-2 number, since 2×78382729² = 12287704410974882, which contains 22 as substring.

Together with 78382727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78382723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39191364 + 39191365.

It is an arithmetic number, because the mean of its divisors is an integer number (39191365).

Almost surely, 2^78382729 is an apocalyptic number.

It is an amenable number.

78382729 is a deficient number, since it is larger than the sum of its proper divisors (1).

78382729 is an equidigital number, since it uses as much as digits as its factorization.

78382729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 46.

The square root of 78382729 is about 8853.4021144417. The cubic root of 78382729 is about 427.9635617653.

The spelling of 78382729 in words is "seventy-eight million, three hundred eighty-two thousand, seven hundred twenty-nine".