78724040 has 32 divisors (see below), whose sum is σ = 178416000. Its totient is φ = 31260864.

The previous prime is 78724031. The next prime is 78724043. The reversal of 78724040 is 4042787.

It is a junction number, because it is equal to n+sod(n) for n = 78723988 and 78724006.

It is not an unprimeable number, because it can be changed into a prime (78724043) 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, 1520 + ... + 12639.

It is an arithmetic number, because the mean of its divisors is an integer number (5575500).

Almost surely, 2^78724040 is an apocalyptic number.

It is an amenable number.

78724040 is an abundant number, since it is smaller than the sum of its proper divisors (99691960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78724040 is a wasteful number, since it uses less digits than its factorization.

78724040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14309 (or 14305 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 78724040 is about 8872.6568737893. The cubic root of 78724040 is about 428.5838394290.

The spelling of 78724040 in words is "seventy-eight million, seven hundred twenty-four thousand, forty".