78805240 has 32 divisors (see below), whose sum is σ = 181439280. Its totient is φ = 30788352.

The previous prime is 78805211. The next prime is 78805241. The reversal of 78805240 is 4250887.

It is a junction number, because it is equal to n+sod(n) for n = 78805196 and 78805205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78805241) 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, 21189 + ... + 24628.

Almost surely, 2^78805240 is an apocalyptic number.

It is an amenable number.

78805240 is an abundant number, since it is smaller than the sum of its proper divisors (102634040).

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

78805240 is a wasteful number, since it uses less digits than its factorization.

78805240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45871 (or 45867 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 78805240 is about 8877.2315504328. The cubic root of 78805240 is about 428.7311432235.

The spelling of 78805240 in words is "seventy-eight million, eight hundred five thousand, two hundred forty".