78680658 has 64 divisors (see below), whose sum is σ = 191600640. Its totient is φ = 21027072.

The previous prime is 78680647. The next prime is 78680659. The reversal of 78680658 is 85608687.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78680659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187573 + ... + 187991.

It is an arithmetic number, because the mean of its divisors is an integer number (2993760).

Almost surely, 2^78680658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78680658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95800320).

78680658 is an abundant number, since it is smaller than the sum of its proper divisors (112919982).

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

78680658 is a wasteful number, since it uses less digits than its factorization.

78680658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711.

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 78680658 is about 8870.2118351255. The cubic root of 78680658 is about 428.5050992269.

The spelling of 78680658 in words is "seventy-eight million, six hundred eighty thousand, six hundred fifty-eight".