78219058 has 4 divisors (see below), whose sum is σ = 117328590. Its totient is φ = 39109528.

The previous prime is 78219049. The next prime is 78219059. The reversal of 78219058 is 85091287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85091287 = 103 ⋅826129.

It can be written as a sum of positive squares in only one way, i.e., 74770609 + 3448449 = 8647^2 + 1857^2 .

It is a super-2 number, since 2×78219058² = 12236442068814728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 78219058.

It is not an unprimeable number, because it can be changed into a prime (78219059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19554763 + ... + 19554766.

Almost surely, 2^78219058 is an apocalyptic number.

78219058 is a deficient number, since it is larger than the sum of its proper divisors (39109532).

78219058 is a wasteful number, since it uses less digits than its factorization.

78219058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39109531.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 78219058 is about 8844.1538883038. The cubic root of 78219058 is about 427.6654772447.

The spelling of 78219058 in words is "seventy-eight million, two hundred nineteen thousand, fifty-eight".