78021330 has 48 divisors (see below), whose sum is σ = 198936000. Its totient is φ = 19579648.

The previous prime is 78021329. The next prime is 78021337. The reversal of 78021330 is 3312087.

It is a self number, because there is not a number n which added to its sum of digits gives 78021330.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78021337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4171 + ... + 13169.

It is an arithmetic number, because the mean of its divisors is an integer number (4144500).

Almost surely, 2^78021330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78021330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99468000).

78021330 is an abundant number, since it is smaller than the sum of its proper divisors (120914670).

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

78021330 is a wasteful number, since it uses less digits than its factorization.

78021330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9043 (or 9026 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 78021330 is about 8832.9683572398. The cubic root of 78021330 is about 427.3048115474.

The spelling of 78021330 in words is "seventy-eight million, twenty-one thousand, three hundred thirty".