161802840 has 32 divisors (see below), whose sum is σ = 485408880. Its totient is φ = 43147392.

The previous prime is 161802829. The next prime is 161802859. The reversal of 161802840 is 48208161.

161802840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 161802798 and 161802807.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 674059 + ... + 674298.

Almost surely, 2^161802840 is an apocalyptic number.

161802840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161802840 is an abundant number, since it is smaller than the sum of its proper divisors (323606040).

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

161802840 is a wasteful number, since it uses less digits than its factorization.

161802840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348371 (or 1348367 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 161802840 is about 12720.1745271046. The cubic root of 161802840 is about 544.9149377667.

The spelling of 161802840 in words is "one hundred sixty-one million, eight hundred two thousand, eight hundred forty".