161862804 has 72 divisors (see below), whose sum is σ = 425748960. Its totient is φ = 51788352.

The previous prime is 161862803. The next prime is 161862809. The reversal of 161862804 is 408268161.

161862804 is a `hidden beast` number, since 16 + 18 + 628 + 0 + 4 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161862803) 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, 236647 + ... + 237329.

It is an arithmetic number, because the mean of its divisors is an integer number (5913180).

Almost surely, 2^161862804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161862804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212874480).

161862804 is an abundant number, since it is smaller than the sum of its proper divisors (263886156).

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

161862804 is a wasteful number, since it uses less digits than its factorization.

161862804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949 (or 944 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 161862804 is about 12722.5313518969. The cubic root of 161862804 is about 544.9822444627.

The spelling of 161862804 in words is "one hundred sixty-one million, eight hundred sixty-two thousand, eight hundred four".