78340505 has 16 divisors (see below), whose sum is σ = 99792000. Its totient is φ = 58835712.

The previous prime is 78340501. The next prime is 78340511. The reversal of 78340505 is 50504387.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78340505 - 2² = 78340501 is a prime.

It is a super-2 number, since 2×78340505² = 12274469447310050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78340501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41492 + ... + 43338.

It is an arithmetic number, because the mean of its divisors is an integer number (6237000).

Almost surely, 2^78340505 is an apocalyptic number.

It is an amenable number.

78340505 is a deficient number, since it is larger than the sum of its proper divisors (21451495).

78340505 is a wasteful number, since it uses less digits than its factorization.

78340505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 78340505 is about 8851.0171731841. The cubic root of 78340505 is about 427.8867013846.

The spelling of 78340505 in words is "seventy-eight million, three hundred forty thousand, five hundred five".