161113788 has 72 divisors (see below), whose sum is σ = 447632640. Its totient is φ = 48454560.

The previous prime is 161113739. The next prime is 161113817. The reversal of 161113788 is 887311161.

It is a happy number.

161113788 is a `hidden beast` number, since 1 + 611 + 1 + 37 + 8 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53581 + ... + 56507.

It is an arithmetic number, because the mean of its divisors is an integer number (6217120).

Almost surely, 2^161113788 is an apocalyptic number.

161113788 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161113788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223816320).

161113788 is an abundant number, since it is smaller than the sum of its proper divisors (286518852).

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

161113788 is a wasteful number, since it uses less digits than its factorization.

161113788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3087 (or 3082 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 161113788 is about 12693.0606238212. The cubic root of 161113788 is about 544.1403139715.

The spelling of 161113788 in words is "one hundred sixty-one million, one hundred thirteen thousand, seven hundred eighty-eight".