78311544072 has 128 divisors (see below), whose sum is σ = 213058252800. Its totient is φ = 23894627328.

The previous prime is 78311544067. The next prime is 78311544079. The reversal of 78311544072 is 27044511387.

It is a super-2 number, since 2×78311544072² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78311544079) 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, 2141413 + ... + 2177675.

It is an arithmetic number, because the mean of its divisors is an integer number (1664517600).

Almost surely, 2^78311544072 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 78311544072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106529126400).

78311544072 is an abundant number, since it is smaller than the sum of its proper divisors (134746708728).

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

78311544072 is a wasteful number, since it uses less digits than its factorization.

78311544072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36435 (or 36431 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The spelling of 78311544072 in words is "seventy-eight billion, three hundred eleven million, five hundred forty-four thousand, seventy-two".