78810436836 has 240 divisors, whose sum is σ = 222742840320. Its totient is φ = 24227216640.

The previous prime is 78810436811. The next prime is 78810436853. The reversal of 78810436836 is 63863401887.

It is a super-2 number, since 2×78810436836² (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 an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 89863230 + ... + 89864106.

It is an arithmetic number, because the mean of its divisors is an integer number (928095168).

Almost surely, 2^78810436836 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 78810436836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111371420160).

78810436836 is an abundant number, since it is smaller than the sum of its proper divisors (143932403484).

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

78810436836 is a wasteful number, since it uses less digits than its factorization.

78810436836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336 (or 1325 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 78810436836 in words is "seventy-eight billion, eight hundred ten million, four hundred thirty-six thousand, eight hundred thirty-six".