161285700 has 72 divisors (see below), whose sum is σ = 468282528. Its totient is φ = 42859520.

The previous prime is 161285693. The next prime is 161285713. The reversal of 161285700 is 7582161.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 105139 + ... + 106661.

It is an arithmetic number, because the mean of its divisors is an integer number (6503924).

Almost surely, 2^161285700 is an apocalyptic number.

161285700 is a gapful number since it is divisible by the number (10) 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 161285700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234141264).

161285700 is an abundant number, since it is smaller than the sum of its proper divisors (306996828).

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

161285700 is a wasteful number, since it uses less digits than its factorization.

161285700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893 (or 1886 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 161285700 is about 12699.8307075331. The cubic root of 161285700 is about 544.3337817875. Note that the first 3 decimals are identical.

The spelling of 161285700 in words is "one hundred sixty-one million, two hundred eighty-five thousand, seven hundred".