78141697920 has 1280 divisors, whose sum is σ = 334406983680. Its totient is φ = 17139548160.

The previous prime is 78141697919. The next prime is 78141697937. The reversal of 78141697920 is 2979614187.

It is a super-2 number, since 2×78141697920² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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 159 ways as a sum of consecutive naturals, for example, 615288897 + ... + 615289023.

It is an arithmetic number, because the mean of its divisors is an integer number (261255456).

Almost surely, 2^78141697920 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 78141697920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167203491840).

78141697920 is an abundant number, since it is smaller than the sum of its proper divisors (256265285760).

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

78141697920 is a wasteful number, since it uses less digits than its factorization.

78141697920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The spelling of 78141697920 in words is "seventy-eight billion, one hundred forty-one million, six hundred ninety-seven thousand, nine hundred twenty".