161378828 has 24 divisors (see below), whose sum is σ = 311214288. Its totient is φ = 72749376.

The previous prime is 161378821. The next prime is 161378843. The reversal of 161378828 is 828873161.

It is a super-2 number, since 2×161378828² = 52086252253307168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161378821) 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 7 ways as a sum of consecutive naturals, for example, 33851 + ... + 38322.

It is an arithmetic number, because the mean of its divisors is an integer number (12967262).

Almost surely, 2^161378828 is an apocalyptic number.

It is an amenable number.

161378828 is a deficient number, since it is larger than the sum of its proper divisors (149835460).

161378828 is a wasteful number, since it uses less digits than its factorization.

161378828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72233 (or 72231 counting only the distinct ones).

The product of its digits is 129024, while the sum is 44.

The square root of 161378828 is about 12703.4966839843. The cubic root of 161378828 is about 544.4385295793.

The spelling of 161378828 in words is "one hundred sixty-one million, three hundred seventy-eight thousand, eight hundred twenty-eight".