78578386040 has 128 divisors (see below), whose sum is σ = 220853675520. Its totient is φ = 24444633600.

The previous prime is 78578386039. The next prime is 78578386097. The reversal of 78578386040 is 4068387587.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1586450 + ... + 1635230.

It is an arithmetic number, because the mean of its divisors is an integer number (1725419340).

Almost surely, 2^78578386040 is an apocalyptic number.

78578386040 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 78578386040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110426837760).

78578386040 is an abundant number, since it is smaller than the sum of its proper divisors (142275289480).

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

78578386040 is a wasteful number, since it uses less digits than its factorization.

78578386040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49333 (or 49329 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 56.

The spelling of 78578386040 in words is "seventy-eight billion, five hundred seventy-eight million, three hundred eighty-six thousand, forty".