78251321280 has 448 divisors, whose sum is σ = 284414976000. Its totient is φ = 18042900480.

The previous prime is 78251321227. The next prime is 78251321287. The reversal of 78251321280 is 8212315287.

It is a super-2 number, since 2×78251321280² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78251321287) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48332311 + ... + 48333929.

Almost surely, 2^78251321280 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 78251321280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142207488000).

78251321280 is an abundant number, since it is smaller than the sum of its proper divisors (206163654720).

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

78251321280 is a wasteful number, since it uses less digits than its factorization.

78251321280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872 (or 1862 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The spelling of 78251321280 in words is "seventy-eight billion, two hundred fifty-one million, three hundred twenty-one thousand, two hundred eighty".