78446450 has 24 divisors (see below), whose sum is σ = 150944580. Its totient is φ = 30296000.

The previous prime is 78446441. The next prime is 78446477. The reversal of 78446450 is 5464487.

It is a Cunningham number, because it is equal to 8857²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 41126569 + 37319881 = 6413^2 + 6109^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25601 + ... + 28500.

Almost surely, 2^78446450 is an apocalyptic number.

78446450 is a deficient number, since it is larger than the sum of its proper divisors (72498130).

78446450 is a wasteful number, since it uses less digits than its factorization.

78446450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54142 (or 54137 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 78446450 is about 8857.0000564525. Note that the first 4 decimals coincide. The cubic root of 78446450 is about 428.0795009100.

The spelling of 78446450 in words is "seventy-eight million, four hundred forty-six thousand, four hundred fifty".