78219718 has 16 divisors (see below), whose sum is σ = 120523536. Its totient is φ = 38050560.

The previous prime is 78219689. The next prime is 78219721. The reversal of 78219718 is 81791287.

It is a happy number.

It is a super-2 number, since 2×78219718² = 12236648567999048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34405 + ... + 36607.

It is an arithmetic number, because the mean of its divisors is an integer number (7532721).

Almost surely, 2^78219718 is an apocalyptic number.

78219718 is a deficient number, since it is larger than the sum of its proper divisors (42303818).

78219718 is a wasteful number, since it uses less digits than its factorization.

78219718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679.

The product of its digits is 56448, while the sum is 43.

The square root of 78219718 is about 8844.1912010087. The cubic root of 78219718 is about 427.6666800992. Note that the first 4 decimals are identical.

The spelling of 78219718 in words is "seventy-eight million, two hundred nineteen thousand, seven hundred eighteen".