78259217 has 8 divisors (see below), whose sum is σ = 80749440. Its totient is φ = 75806640.

The previous prime is 78259189. The next prime is 78259219. The reversal of 78259217 is 71295287.

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 78259217 - 2²⁰ = 77210641 is a prime.

It is a super-2 number, since 2×78259217² = 12249010090906178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78259219) 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, 5159 + ... + 13532.

It is an arithmetic number, because the mean of its divisors is an integer number (10093680).

Almost surely, 2^78259217 is an apocalyptic number.

It is an amenable number.

78259217 is a deficient number, since it is larger than the sum of its proper divisors (2490223).

78259217 is a wasteful number, since it uses less digits than its factorization.

78259217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18823.

The product of its digits is 70560, while the sum is 41.

The square root of 78259217 is about 8846.4239667789. The cubic root of 78259217 is about 427.7386549755.

The spelling of 78259217 in words is "seventy-eight million, two hundred fifty-nine thousand, two hundred seventeen".