117777845 has 24 divisors (see below), whose sum is σ = 150529704. Its totient is φ = 88397568.

The previous prime is 117777841. The next prime is 117777851. The reversal of 117777845 is 548777711.

It can be written as a sum of positive squares in 12 ways, for example, as 2709316 + 115068529 = 1646^2 + 10727^2 .

It is not a de Polignac number, because 117777845 - 2² = 117777841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 117777845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117777841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155207 + ... + 155963.

It is an arithmetic number, because the mean of its divisors is an integer number (6272071).

Almost surely, 2^117777845 is an apocalyptic number.

It is an amenable number.

117777845 is a deficient number, since it is larger than the sum of its proper divisors (32751859).

117777845 is an equidigital number, since it uses as much as digits as its factorization.

117777845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857 (or 828 counting only the distinct ones).

The product of its digits is 384160, while the sum is 47.

The square root of 117777845 is about 10852.5501611372. The cubic root of 117777845 is about 490.1788115967.

The spelling of 117777845 in words is "one hundred seventeen million, seven hundred seventy-seven thousand, eight hundred forty-five".