78408065 has 8 divisors (see below), whose sum is σ = 94392168. Its totient is φ = 62524800.

The previous prime is 78408061. The next prime is 78408067. The reversal of 78408065 is 56080487.

It can be written as a sum of positive squares in 4 ways, for example, as 4293184 + 74114881 = 2072^2 + 8609^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78408065 - 2² = 78408061 is a prime.

It is a super-2 number, since 2×78408065² = 12295649314088450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78408061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23486 + ... + 26615.

It is an arithmetic number, because the mean of its divisors is an integer number (11799021).

Almost surely, 2^78408065 is an apocalyptic number.

It is an amenable number.

78408065 is a deficient number, since it is larger than the sum of its proper divisors (15984103).

78408065 is a wasteful number, since it uses less digits than its factorization.

78408065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50419.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 78408065 is about 8854.8328612120. The cubic root of 78408065 is about 428.0096676565.

The spelling of 78408065 in words is "seventy-eight million, four hundred eight thousand, sixty-five".