78189320 has 64 divisors (see below), whose sum is σ = 194322240. Its totient is φ = 28076800.

The previous prime is 78189299. The next prime is 78189361. The reversal of 78189320 is 2398187.

It is a super-2 number, since 2×78189320² = 12227139524124800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35450 + ... + 37590.

It is an arithmetic number, because the mean of its divisors is an integer number (3036285).

Almost surely, 2^78189320 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 78189320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97161120).

78189320 is an abundant number, since it is smaller than the sum of its proper divisors (116132920).

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

78189320 is a wasteful number, since it uses less digits than its factorization.

78189320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246 (or 2242 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 78189320 is about 8842.4725049049. The cubic root of 78189320 is about 427.6112725178.

The spelling of 78189320 in words is "seventy-eight million, one hundred eighty-nine thousand, three hundred twenty".