78321535188 has 24 divisors (see below), whose sum is σ = 196807960608. Its totient is φ = 24098933856.

The previous prime is 78321535183. The next prime is 78321535189. The reversal of 78321535188 is 88153512387.

It is a super-2 number, since 2×78321535188² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78321535188.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78321535181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251030406 + ... + 251030717.

It is an arithmetic number, because the mean of its divisors is an integer number (8200331692).

Almost surely, 2^78321535188 is an apocalyptic number.

78321535188 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

78321535188 is an abundant number, since it is smaller than the sum of its proper divisors (118486425420).

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

78321535188 is a wasteful number, since it uses less digits than its factorization.

78321535188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502061143 (or 502061141 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 51.

The spelling of 78321535188 in words is "seventy-eight billion, three hundred twenty-one million, five hundred thirty-five thousand, one hundred eighty-eight".