162881820 has 96 divisors (see below), whose sum is σ = 511660800. Its totient is φ = 43013952.

The previous prime is 162881819. The next prime is 162881833. The reversal of 162881820 is 28188261.

162881820 is a `hidden beast` number, since 1 + 628 + 8 + 1 + 8 + 20 = 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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56371 + ... + 59189.

It is an arithmetic number, because the mean of its divisors is an integer number (5329800).

Almost surely, 2^162881820 is an apocalyptic number.

162881820 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 162881820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255830400).

162881820 is an abundant number, since it is smaller than the sum of its proper divisors (348778980).

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

162881820 is a wasteful number, since it uses less digits than its factorization.

162881820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944 (or 2936 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 162881820 is about 12762.5162095881. The cubic root of 162881820 is about 546.1235078647.

The spelling of 162881820 in words is "one hundred sixty-two million, eight hundred eighty-one thousand, eight hundred twenty".