78354317 has 8 divisors (see below), whose sum is σ = 82386840. Its totient is φ = 74410560.

The previous prime is 78354253. The next prime is 78354319. The reversal of 78354317 is 71345387.

It can be written as a sum of positive squares in 4 ways, for example, as 7474756 + 70879561 = 2734^2 + 8419^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78354317 - 2⁶ = 78354253 is a prime.

It is a super-2 number, since 2×78354317² = 12278797985072978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78354319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20378 + ... + 23915.

It is an arithmetic number, because the mean of its divisors is an integer number (10298355).

Almost surely, 2^78354317 is an apocalyptic number.

It is an amenable number.

78354317 is a deficient number, since it is larger than the sum of its proper divisors (4032523).

78354317 is a wasteful number, since it uses less digits than its factorization.

78354317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44383.

The product of its digits is 70560, while the sum is 38.

The square root of 78354317 is about 8851.7973881015. The cubic root of 78354317 is about 427.9118464179.

The spelling of 78354317 in words is "seventy-eight million, three hundred fifty-four thousand, three hundred seventeen".