78648583 has 4 divisors (see below), whose sum is σ = 84698488. Its totient is φ = 72598680.

The previous prime is 78648571. The next prime is 78648587. The reversal of 78648583 is 38584687.

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

It is a cyclic number.

It is not a de Polignac number, because 78648583 - 2⁹ = 78648071 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 (78648587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3024933 + ... + 3024958.

It is an arithmetic number, because the mean of its divisors is an integer number (21174622).

Almost surely, 2^78648583 is an apocalyptic number.

78648583 is a deficient number, since it is larger than the sum of its proper divisors (6049905).

78648583 is a wasteful number, since it uses less digits than its factorization.

78648583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6049904.

The product of its digits is 1290240, while the sum is 49.

The square root of 78648583 is about 8868.4036331236. The cubic root of 78648583 is about 428.4468631051.

The spelling of 78648583 in words is "seventy-eight million, six hundred forty-eight thousand, five hundred eighty-three".