117857720 has 16 divisors (see below), whose sum is σ = 265179960. Its totient is φ = 47143072.

The previous prime is 117857713. The next prime is 117857723. The reversal of 117857720 is 27758711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117857723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1473182 + ... + 1473261.

Almost surely, 2^117857720 is an apocalyptic number.

117857720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

117857720 is an abundant number, since it is smaller than the sum of its proper divisors (147322240).

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

117857720 is a wasteful number, since it uses less digits than its factorization.

117857720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2946454 (or 2946450 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 38.

The square root of 117857720 is about 10856.2295480521. The cubic root of 117857720 is about 490.2895969625.

Subtracting from 117857720 its reverse (27758711), we obtain a palindrome (90099009).

The spelling of 117857720 in words is "one hundred seventeen million, eight hundred fifty-seven thousand, seven hundred twenty".