117645640 has 32 divisors (see below), whose sum is σ = 302518080. Its totient is φ = 40335552.

The previous prime is 117645631. The next prime is 117645643. The reversal of 117645640 is 46546711.

It is a super-2 number, since 2×117645640² = 27680993222019200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 117645596 and 117645605.

It is not an unprimeable number, because it can be changed into a prime (117645643) 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, 209802 + ... + 210361.

It is an arithmetic number, because the mean of its divisors is an integer number (9453690).

Almost surely, 2^117645640 is an apocalyptic number.

117645640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

117645640 is an abundant number, since it is smaller than the sum of its proper divisors (184872440).

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

117645640 is a wasteful number, since it uses less digits than its factorization.

117645640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420181 (or 420177 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 117645640 is about 10846.4574862026. The cubic root of 117645640 is about 489.9953352326.

The spelling of 117645640 in words is "one hundred seventeen million, six hundred forty-five thousand, six hundred forty".