78785513400 has 192 divisors, whose sum is σ = 273640164480. Its totient is φ = 18583257600.

The previous prime is 78785513377. The next prime is 78785513453. The reversal of 78785513400 is 431558787.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 78785513400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 82887 + ... + 405513.

It is an arithmetic number, because the mean of its divisors is an integer number (1425209190).

Almost surely, 2^78785513400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78785513400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136820082240).

78785513400 is an abundant number, since it is smaller than the sum of its proper divisors (194854651080).

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

78785513400 is a wasteful number, since it uses less digits than its factorization.

78785513400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322694 (or 322685 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 48.

The spelling of 78785513400 in words is "seventy-eight billion, seven hundred eighty-five million, five hundred thirteen thousand, four hundred".