78806217 has 8 divisors (see below), whose sum is σ = 120085696. Its totient is φ = 45032112.

The previous prime is 78806209. The next prime is 78806251. The reversal of 78806217 is 71260887.

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

It is not a de Polignac number, because 78806217 - 2³ = 78806209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78806267) 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, 1876318 + ... + 1876359.

It is an arithmetic number, because the mean of its divisors is an integer number (15010712).

Almost surely, 2^78806217 is an apocalyptic number.

It is an amenable number.

78806217 is a deficient number, since it is larger than the sum of its proper divisors (41279479).

78806217 is a wasteful number, since it uses less digits than its factorization.

78806217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3752687.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 78806217 is about 8877.2865786793. The cubic root of 78806217 is about 428.7329149694.

The spelling of 78806217 in words is "seventy-eight million, eight hundred six thousand, two hundred seventeen".