161228690 has 32 divisors (see below), whose sum is σ = 343111680. Its totient is φ = 53371584.

The previous prime is 161228677. The next prime is 161228707. The reversal of 161228690 is 96822161.

161228690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161228690² = 51989380958232200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 161228690.

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 15 ways as a sum of consecutive naturals, for example, 37682 + ... + 41741.

It is an arithmetic number, because the mean of its divisors is an integer number (10722240).

Almost surely, 2^161228690 is an apocalyptic number.

161228690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161228690 is an abundant number, since it is smaller than the sum of its proper divisors (181882990).

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

161228690 is a wasteful number, since it uses less digits than its factorization.

161228690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79466.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 161228690 is about 12697.5859910457. The cubic root of 161228690 is about 544.2696386222.

The spelling of 161228690 in words is "one hundred sixty-one million, two hundred twenty-eight thousand, six hundred ninety".