78895440 has 120 divisors (see below), whose sum is σ = 285372360. Its totient is φ = 19418112.

The previous prime is 78895409. The next prime is 78895441. The reversal of 78895440 is 4459887.

It can be written as a sum of positive squares in 4 ways, for example, as 254016 + 78641424 = 504^2 + 8868^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78895441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5146 + ... + 13574.

It is an arithmetic number, because the mean of its divisors is an integer number (2378103).

Almost surely, 2^78895440 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 78895440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142686180).

78895440 is an abundant number, since it is smaller than the sum of its proper divisors (206476920).

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

78895440 is a wasteful number, since it uses less digits than its factorization.

78895440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8461 (or 8452 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 78895440 is about 8882.3105102220. The cubic root of 78895440 is about 428.8946552103.

The spelling of 78895440 in words is "seventy-eight million, eight hundred ninety-five thousand, four hundred forty".