785321688138 has 32 divisors (see below), whose sum is σ = 1711841173056. Its totient is φ = 238726146048.

The previous prime is 785321688101. The next prime is 785321688181. The reversal of 785321688138 is 831886123587.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60645495 + ... + 60658442.

It is an arithmetic number, because the mean of its divisors is an integer number (53495036658).

Almost surely, 2^785321688138 is an apocalyptic number.

785321688138 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

785321688138 is an abundant number, since it is smaller than the sum of its proper divisors (926519484918).

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

785321688138 is a wasteful number, since it uses less digits than its factorization.

785321688138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121304038.

The product of its digits is 15482880, while the sum is 60.

The spelling of 785321688138 in words is "seven hundred eighty-five billion, three hundred twenty-one million, six hundred eighty-eight thousand, one hundred thirty-eight".