78807040 has 128 divisors (see below), whose sum is σ = 209187720. Its totient is φ = 28311552.

The previous prime is 78807037. The next prime is 78807049. The reversal of 78807040 is 4070887.

It can be written as a sum of positive squares in 4 ways, for example, as 65028096 + 13778944 = 8064^2 + 3712^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 78806987 and 78807005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78807049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2129902 + ... + 2129938.

Almost surely, 2^78807040 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 78807040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104593860).

78807040 is an abundant number, since it is smaller than the sum of its proper divisors (130380680).

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

78807040 is an equidigital number, since it uses as much as digits as its factorization.

78807040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 78807040 is about 8877.3329328126. The cubic root of 78807040 is about 428.7344074319.

The spelling of 78807040 in words is "seventy-eight million, eight hundred seven thousand, forty".