117777720 has 32 divisors (see below), whose sum is σ = 353333520. Its totient is φ = 31407360.

The previous prime is 117777679. The next prime is 117777721. The reversal of 117777720 is 27777711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117777721) 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 7 ways as a sum of consecutive naturals, for example, 490621 + ... + 490860.

Almost surely, 2^117777720 is an apocalyptic number.

117777720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

117777720 is an abundant number, since it is smaller than the sum of its proper divisors (235555800).

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

117777720 is a wasteful number, since it uses less digits than its factorization.

117777720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981495 (or 981491 counting only the distinct ones).

The product of its (nonzero) digits is 33614, while the sum is 39.

The square root of 117777720 is about 10852.5444021206. The cubic root of 117777720 is about 490.1786381844.

Subtracting from 117777720 its reverse (27777711), we obtain a palindrome (90000009).

The spelling of 117777720 in words is "one hundred seventeen million, seven hundred seventy-seven thousand, seven hundred twenty".