78308535280 has 160 divisors (see below), whose sum is σ = 192984791040. Its totient is φ = 29506498560.

The previous prime is 78308535269. The next prime is 78308535281. The reversal of 78308535280 is 8253580387.

It is a happy number.

It is a super-2 number, since 2×78308535280² (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 (78308535281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17970862 + ... + 17975218.

It is an arithmetic number, because the mean of its divisors is an integer number (1206154944).

Almost surely, 2^78308535280 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 78308535280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96492395520).

78308535280 is an abundant number, since it is smaller than the sum of its proper divisors (114676255760).

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

78308535280 is a wasteful number, since it uses less digits than its factorization.

78308535280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4587 (or 4581 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 78308535280 in words is "seventy-eight billion, three hundred eight million, five hundred thirty-five thousand, two hundred eighty".