78019650520 has 128 divisors (see below), whose sum is σ = 207688458240. Its totient is φ = 25812357120.

The previous prime is 78019650517. The next prime is 78019650521. The reversal of 78019650520 is 2505691087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78019650521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3051309 + ... + 3076771.

It is an arithmetic number, because the mean of its divisors is an integer number (1622566080).

Almost surely, 2^78019650520 is an apocalyptic number.

78019650520 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78019650520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103844229120).

78019650520 is an abundant number, since it is smaller than the sum of its proper divisors (129668807720).

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

78019650520 is a wasteful number, since it uses less digits than its factorization.

78019650520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25865 (or 25861 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 43.

The spelling of 78019650520 in words is "seventy-eight billion, nineteen million, six hundred fifty thousand, five hundred twenty".