78578573 has 8 divisors (see below), whose sum is σ = 83290680. Its totient is φ = 73876480.

The previous prime is 78578569. The next prime is 78578579. The reversal of 78578573 is 37587587.

It can be written as a sum of positive squares in 4 ways, for example, as 44262409 + 34316164 = 6653^2 + 5858^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78578573 - 2² = 78578569 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78578579) 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 7 ways as a sum of consecutive naturals, for example, 19013 + ... + 22773.

It is an arithmetic number, because the mean of its divisors is an integer number (10411335).

Almost surely, 2^78578573 is an apocalyptic number.

It is an amenable number.

78578573 is a deficient number, since it is larger than the sum of its proper divisors (4712107).

78578573 is a wasteful number, since it uses less digits than its factorization.

78578573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5007.

The product of its digits is 1646400, while the sum is 50.

The square root of 78578573 is about 8864.4555952410. The cubic root of 78578573 is about 428.3196962893.

The spelling of 78578573 in words is "seventy-eight million, five hundred seventy-eight thousand, five hundred seventy-three".