78257219 has 6 divisors (see below), whose sum is σ = 82593180. Its totient is φ = 74138076.

The previous prime is 78257213. The next prime is 78257261. The reversal of 78257219 is 91275287.

It is not a de Polignac number, because 78257219 - 2⁸ = 78256963 is a prime.

It is a super-2 number, since 2×78257219² = 12248384651227922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78257213) 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 5 ways as a sum of consecutive naturals, for example, 108029 + ... + 108750.

It is an arithmetic number, because the mean of its divisors is an integer number (13765530).

Almost surely, 2^78257219 is an apocalyptic number.

78257219 is a deficient number, since it is larger than the sum of its proper divisors (4335961).

78257219 is a wasteful number, since it uses less digits than its factorization.

78257219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216817 (or 216798 counting only the distinct ones).

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

The square root of 78257219 is about 8846.3110390716. The cubic root of 78257219 is about 427.7350148117.

The spelling of 78257219 in words is "seventy-eight million, two hundred fifty-seven thousand, two hundred nineteen".