78911040 has 112 divisors (see below), whose sum is σ = 269857728. Its totient is φ = 19421184.

The previous prime is 78911039. The next prime is 78911051. The reversal of 78911040 is 4011987.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 78910989 and 78911007.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9319 + ... + 15641.

It is an arithmetic number, because the mean of its divisors is an integer number (2409444).

Almost surely, 2^78911040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78911040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134928864).

78911040 is an abundant number, since it is smaller than the sum of its proper divisors (190946688).

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

78911040 is a wasteful number, since it uses less digits than its factorization.

78911040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6356 (or 6346 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 78911040 is about 8883.1886167074. The cubic root of 78911040 is about 428.9229218024.

The spelling of 78911040 in words is "seventy-eight million, nine hundred eleven thousand, forty".