78383508840 has 896 divisors, whose sum is σ = 329641804800. Its totient is φ = 16325867520.

The previous prime is 78383508817. The next prime is 78383508869. The reversal of 78383508840 is 4880538387.

It is a super-2 number, since 2×78383508840² (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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 289237905 + ... + 289238175.

It is an arithmetic number, because the mean of its divisors is an integer number (367903800).

Almost surely, 2^78383508840 is an apocalyptic number.

78383508840 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 78383508840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164820902400).

78383508840 is an abundant number, since it is smaller than the sum of its proper divisors (251258295960).

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

78383508840 is a wasteful number, since it uses less digits than its factorization.

78383508840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 54.

The spelling of 78383508840 in words is "seventy-eight billion, three hundred eighty-three million, five hundred eight thousand, eight hundred forty".