161249628 has 48 divisors (see below), whose sum is σ = 390368160. Its totient is φ = 51744000.

The previous prime is 161249623. The next prime is 161249651. The reversal of 161249628 is 826942161.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161249623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229678 + ... + 230378.

It is an arithmetic number, because the mean of its divisors is an integer number (8132670).

Almost surely, 2^161249628 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 161249628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195184080).

161249628 is an abundant number, since it is smaller than the sum of its proper divisors (229118532).

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

161249628 is a wasteful number, since it uses less digits than its factorization.

161249628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398 (or 1396 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 161249628 is about 12698.4104517062. The cubic root of 161249628 is about 544.2931981686.

It can be divided in two parts, 16124 and 9628, that added together give a palindrome (25752).

The spelling of 161249628 in words is "one hundred sixty-one million, two hundred forty-nine thousand, six hundred twenty-eight".