78978784 has 24 divisors (see below), whose sum is σ = 156922920. Its totient is φ = 39125376.

The previous prime is 78978743. The next prime is 78978797. The reversal of 78978784 is 48787987.

It is a congruent number.

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, 7834 + ... + 14809.

It is an arithmetic number, because the mean of its divisors is an integer number (6538455).

Almost surely, 2^78978784 is an apocalyptic number.

It is an amenable number.

78978784 is a deficient number, since it is larger than the sum of its proper divisors (77944136).

78978784 is a wasteful number, since it uses less digits than its factorization.

78978784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22762 (or 22754 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 58.

The square root of 78978784 is about 8887.0008439293. Note that the first 3 decimals coincide. The cubic root of 78978784 is about 429.0456280946.

The spelling of 78978784 in words is "seventy-eight million, nine hundred seventy-eight thousand, seven hundred eighty-four".