78330442 has 8 divisors (see below), whose sum is σ = 117534276. Its totient is φ = 39152352.

The previous prime is 78330431. The next prime is 78330457. The reversal of 78330442 is 24403387.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 76720081 + 1610361 = 8759^2 + 1269^2 .

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

It is a super-2 number, since 2×78330442² = 12271316287830728, which contains 22 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 5908 + ... + 13840.

Almost surely, 2^78330442 is an apocalyptic number.

78330442 is a deficient number, since it is larger than the sum of its proper divisors (39203834).

78330442 is a wasteful number, since it uses less digits than its factorization.

78330442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12872.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 78330442 is about 8850.4486891908. The cubic root of 78330442 is about 427.8683796226.

The spelling of 78330442 in words is "seventy-eight million, three hundred thirty thousand, four hundred forty-two".