78724784 has 10 divisors (see below), whose sum is σ = 152529300. Its totient is φ = 39362384.

The previous prime is 78724783. The next prime is 78724813. The reversal of 78724784 is 48742787.

It is not an unprimeable number, because it can be changed into a prime (78724781) 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 as a sum of consecutive naturals, namely, 2460134 + ... + 2460165.

It is an arithmetic number, because the mean of its divisors is an integer number (15252930).

Almost surely, 2^78724784 is an apocalyptic number.

It is an amenable number.

78724784 is a deficient number, since it is larger than the sum of its proper divisors (73804516).

78724784 is a wasteful number, since it uses less digits than its factorization.

78724784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4920307 (or 4920301 counting only the distinct ones).

The product of its digits is 702464, while the sum is 47.

The square root of 78724784 is about 8872.6988002524. The cubic root of 78724784 is about 428.5851895687.

The spelling of 78724784 in words is "seventy-eight million, seven hundred twenty-four thousand, seven hundred eighty-four".