78555240 has 96 divisors (see below), whose sum is σ = 263577600. Its totient is φ = 20269440.

The previous prime is 78555233. The next prime is 78555241. The reversal of 78555240 is 4255587.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 78555195 and 78555204.

It is not an unprimeable number, because it can be changed into a prime (78555241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7641 + ... + 14679.

It is an arithmetic number, because the mean of its divisors is an integer number (2745600).

Almost surely, 2^78555240 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 78555240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131788800).

78555240 is an abundant number, since it is smaller than the sum of its proper divisors (185022360).

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

78555240 is a wasteful number, since it uses less digits than its factorization.

78555240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7087 (or 7080 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The square root of 78555240 is about 8863.1393986555. The cubic root of 78555240 is about 428.2772972296.

The spelling of 78555240 in words is "seventy-eight million, five hundred fifty-five thousand, two hundred forty".