117780891438 has 96 divisors (see below), whose sum is σ = 276515831808. Its totient is φ = 33345950400.

The previous prime is 117780891413. The next prime is 117780891439. The reversal of 117780891438 is 834198087711.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117780891439) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44094843 + ... + 44097513.

It is an arithmetic number, because the mean of its divisors is an integer number (2880373248).

Almost surely, 2^117780891438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 117780891438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138257915904).

117780891438 is an abundant number, since it is smaller than the sum of its proper divisors (158734940370).

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

117780891438 is a wasteful number, since it uses less digits than its factorization.

117780891438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998 (or 3991 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 57.

The spelling of 117780891438 in words is "one hundred seventeen billion, seven hundred eighty million, eight hundred ninety-one thousand, four hundred thirty-eight".