78730445 has 4 divisors (see below), whose sum is σ = 94476540. Its totient is φ = 62984352.

The previous prime is 78730441. The next prime is 78730469. The reversal of 78730445 is 54403787.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48469444 + 30261001 = 6962^2 + 5501^2 .

It is a cyclic number.

It is not a de Polignac number, because 78730445 - 2² = 78730441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78730399 and 78730408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78730441) 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 in 3 ways as a sum of consecutive naturals, for example, 7873040 + ... + 7873049.

It is an arithmetic number, because the mean of its divisors is an integer number (23619135).

Almost surely, 2^78730445 is an apocalyptic number.

It is an amenable number.

78730445 is a deficient number, since it is larger than the sum of its proper divisors (15746095).

78730445 is a wasteful number, since it uses less digits than its factorization.

78730445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15746094.

The product of its (nonzero) digits is 94080, while the sum is 38.

The square root of 78730445 is about 8873.0178068118. The cubic root of 78730445 is about 428.5954623294.

The spelling of 78730445 in words is "seventy-eight million, seven hundred thirty thousand, four hundred forty-five".