78411946 has 4 divisors (see below), whose sum is σ = 117617922. Its totient is φ = 39205972.

The previous prime is 78411913. The next prime is 78411947. The reversal of 78411946 is 64911487.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 64979721 + 13432225 = 8061^2 + 3665^2 .

It is a super-2 number, since 2×78411946² = 12296866551013832, 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 junction number, because it is equal to n+sod(n) for n = 78411899 and 78411908.

It is not an unprimeable number, because it can be changed into a prime (78411947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19602985 + ... + 19602988.

Almost surely, 2^78411946 is an apocalyptic number.

78411946 is a deficient number, since it is larger than the sum of its proper divisors (39205976).

78411946 is a wasteful number, since it uses less digits than its factorization.

78411946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39205975.

The product of its digits is 48384, while the sum is 40.

The square root of 78411946 is about 8855.0520043645. The cubic root of 78411946 is about 428.0167293371.

The spelling of 78411946 in words is "seventy-eight million, four hundred eleven thousand, nine hundred forty-six".