117661720 has 32 divisors (see below), whose sum is σ = 288807120. Its totient is φ = 42785920.

The previous prime is 117661703. The next prime is 117661723. The reversal of 117661720 is 27166711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117661723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133267 + ... + 134146.

Almost surely, 2^117661720 is an apocalyptic number.

117661720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

117661720 is an abundant number, since it is smaller than the sum of its proper divisors (171145400).

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

117661720 is a wasteful number, since it uses less digits than its factorization.

117661720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267435 (or 267431 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 117661720 is about 10847.1987167194. The cubic root of 117661720 is about 490.0176586722.

The spelling of 117661720 in words is "one hundred seventeen million, six hundred sixty-one thousand, seven hundred twenty".