117720785 has 48 divisors (see below), whose sum is σ = 184778496. Its totient is φ = 71229312.

The previous prime is 117720781. The next prime is 117720787. The reversal of 117720785 is 587027711.

It is not a de Polignac number, because 117720785 - 2² = 117720781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117720781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72452 + ... + 74058.

It is an arithmetic number, because the mean of its divisors is an integer number (3849552).

Almost surely, 2^117720785 is an apocalyptic number.

It is an amenable number.

117720785 is a deficient number, since it is larger than the sum of its proper divisors (67057711).

117720785 is a wasteful number, since it uses less digits than its factorization.

117720785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662 (or 1655 counting only the distinct ones).

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

The square root of 117720785 is about 10849.9209674541. The cubic root of 117720785 is about 490.0996396012.

The spelling of 117720785 in words is "one hundred seventeen million, seven hundred twenty thousand, seven hundred eighty-five".