78660648 has 72 divisors (see below), whose sum is σ = 234193050. Its totient is φ = 23833920.

The previous prime is 78660641. The next prime is 78660689. The reversal of 78660648 is 84606687.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 40985604 + 37675044 = 6402^2 + 6138^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (78660641) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4198 + ... + 13226.

Almost surely, 2^78660648 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 78660648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117096525).

78660648 is an abundant number, since it is smaller than the sum of its proper divisors (155532402).

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

78660648 is a wasteful number, since it uses less digits than its factorization.

78660648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9063 (or 9045 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 78660648 is about 8869.0838309264. The cubic root of 78660648 is about 428.4687704593.

The spelling of 78660648 in words is "seventy-eight million, six hundred sixty thousand, six hundred forty-eight".