78690320 has 40 divisors (see below), whose sum is σ = 185285760. Its totient is φ = 31075200.

The previous prime is 78690317. The next prime is 78690347. The reversal of 78690320 is 2309687.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95 + ... + 12545.

It is an arithmetic number, because the mean of its divisors is an integer number (4632144).

Almost surely, 2^78690320 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 78690320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92642880).

78690320 is an abundant number, since it is smaller than the sum of its proper divisors (106595440).

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

78690320 is a wasteful number, since it uses less digits than its factorization.

78690320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12543 (or 12537 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 78690320 is about 8870.7564502696. The cubic root of 78690320 is about 428.5226386786.

The spelling of 78690320 in words is "seventy-eight million, six hundred ninety thousand, three hundred twenty".