161128420 has 24 divisors (see below), whose sum is σ = 338688000. Its totient is φ = 64390752.

The previous prime is 161128399. The next prime is 161128441. The reversal of 161128420 is 24821161.

161128420 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161128399) and next prime (161128441).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22431 + ... + 28729.

It is an arithmetic number, because the mean of its divisors is an integer number (14112000).

Almost surely, 2^161128420 is an apocalyptic number.

161128420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161128420 is an abundant number, since it is smaller than the sum of its proper divisors (177559580).

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

161128420 is a wasteful number, since it uses less digits than its factorization.

161128420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7587 (or 7585 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 161128420 is about 12693.6369886648. The cubic root of 161128420 is about 544.1567860152.

Adding to 161128420 its reverse (24821161), we get a palindrome (185949581).

The spelling of 161128420 in words is "one hundred sixty-one million, one hundred twenty-eight thousand, four hundred twenty".