78363743640 has 512 divisors, whose sum is σ = 306067507200. Its totient is φ = 15586836480.

The previous prime is 78363743639. The next prime is 78363743681. The reversal of 78363743640 is 4634736387.

It is a happy number.

It is a super-2 number, since 2×78363743640² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 48342030 + ... + 48343650.

It is an arithmetic number, because the mean of its divisors is an integer number (597788100).

Almost surely, 2^78363743640 is an apocalyptic number.

78363743640 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 78363743640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153033753600).

78363743640 is an abundant number, since it is smaller than the sum of its proper divisors (227703763560).

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

78363743640 is a wasteful number, since it uses less digits than its factorization.

78363743640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907 (or 1903 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 51.

The spelling of 78363743640 in words is "seventy-eight billion, three hundred sixty-three million, seven hundred forty-three thousand, six hundred forty".