161356428 has 48 divisors (see below), whose sum is σ = 422271360. Its totient is φ = 53278992.

The previous prime is 161356423. The next prime is 161356513. The reversal of 161356428 is 824653161.

It is a happy number.

161356428 is a `hidden beast` number, since 1 + 6 + 1 + 3 + 5 + 642 + 8 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 161356392 and 161356401.

It is not an unprimeable number, because it can be changed into a prime (161356423) 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 15 ways as a sum of consecutive naturals, for example, 4575 + ... + 18537.

It is an arithmetic number, because the mean of its divisors is an integer number (8797320).

Almost surely, 2^161356428 is an apocalyptic number.

161356428 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 161356428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211135680).

161356428 is an abundant number, since it is smaller than the sum of its proper divisors (260914932).

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

161356428 is a wasteful number, since it uses less digits than its factorization.

161356428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14083 (or 14075 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 161356428 is about 12702.6150063678. The cubic root of 161356428 is about 544.4133383620.

The spelling of 161356428 in words is "one hundred sixty-one million, three hundred fifty-six thousand, four hundred twenty-eight".