117981728 has 12 divisors (see below), whose sum is σ = 232276590. Its totient is φ = 58990848.

The previous prime is 117981719. The next prime is 117981737. The reversal of 117981728 is 827189711.

It is an interprime number because it is at equal distance from previous prime (117981719) and next prime (117981737).

It can be written as a sum of positive squares in only one way, i.e., 60403984 + 57577744 = 7772^2 + 7588^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1843433 + ... + 1843496.

Almost surely, 2^117981728 is an apocalyptic number.

It is an amenable number.

117981728 is a deficient number, since it is larger than the sum of its proper divisors (114294862).

117981728 is an equidigital number, since it uses as much as digits as its factorization.

117981728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3686939 (or 3686931 counting only the distinct ones).

The product of its digits is 56448, while the sum is 44.

The square root of 117981728 is about 10861.9394216687. The cubic root of 117981728 is about 490.4614949669.

The spelling of 117981728 in words is "one hundred seventeen million, nine hundred eighty-one thousand, seven hundred twenty-eight".