117981428 has 24 divisors (see below), whose sum is σ = 219029832. Its totient is φ = 55414784.

The previous prime is 117981427. The next prime is 117981449. The reversal of 117981428 is 824189711.

It can be written as a sum of positive squares in 4 ways, for example, as 24820324 + 93161104 = 4982^2 + 9652^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117981427) 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, 43076 + ... + 45732.

It is an arithmetic number, because the mean of its divisors is an integer number (9126243).

Almost surely, 2^117981428 is an apocalyptic number.

It is an amenable number.

117981428 is a deficient number, since it is larger than the sum of its proper divisors (101048404).

117981428 is a wasteful number, since it uses less digits than its factorization.

117981428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331 (or 3329 counting only the distinct ones).

The product of its digits is 32256, while the sum is 41.

The square root of 117981428 is about 10861.9256119714. The cubic root of 117981428 is about 490.4610792568.

The spelling of 117981428 in words is "one hundred seventeen million, nine hundred eighty-one thousand, four hundred twenty-eight".