78840000 has 280 divisors, whose sum is σ = 293593520. Its totient is φ = 20736000.

The previous prime is 78839953. The next prime is 78840023. The reversal of 78840000 is 4887.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1079964 + ... + 1080036.

Almost surely, 2^78840000 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 78840000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146796760).

78840000 is an abundant number, since it is smaller than the sum of its proper divisors (214753520).

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

78840000 is an equidigital number, since it uses as much as digits as its factorization.

78840000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 78840000 is about 8879.1891521692. The cubic root of 78840000 is about 428.7941699289.

Adding to 78840000 its reverse (4887), we get a palindrome (78844887).

The spelling of 78840000 in words is "seventy-eight million, eight hundred forty thousand".