78289745280 has 128 divisors (see below), whose sum is σ = 249677272800. Its totient is φ = 20866498560.

The previous prime is 78289745239. The next prime is 78289745291. The reversal of 78289745280 is 8254798287.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×78289745280² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

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 15 ways as a sum of consecutive naturals, for example, 4139686 + ... + 4158554.

Almost surely, 2^78289745280 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 78289745280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124838636400).

78289745280 is an abundant number, since it is smaller than the sum of its proper divisors (171387527520).

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

78289745280 is a wasteful number, since it uses less digits than its factorization.

78289745280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21052 (or 21040 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 60.

The spelling of 78289745280 in words is "seventy-eight billion, two hundred eighty-nine million, seven hundred forty-five thousand, two hundred eighty".