78798111840 has 288 divisors, whose sum is σ = 308029962240. Its totient is φ = 17968960512.

The previous prime is 78798111809. The next prime is 78798111841. The reversal of 78798111840 is 4811189787.

It is a tau number, because it is divible by the number of its divisors (288).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78798111841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4416217 + ... + 4434023.

It is an arithmetic number, because the mean of its divisors is an integer number (1069548480).

Almost surely, 2^78798111840 is an apocalyptic number.

78798111840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78798111840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154014981120).

78798111840 is an abundant number, since it is smaller than the sum of its proper divisors (229231850400).

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

78798111840 is a wasteful number, since it uses less digits than its factorization.

78798111840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18274 (or 18263 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 54.

The spelling of 78798111840 in words is "seventy-eight billion, seven hundred ninety-eight million, one hundred eleven thousand, eight hundred forty".