161673678 has 16 divisors (see below), whose sum is σ = 359274960. Its totient is φ = 53891208.

The previous prime is 161673671. The next prime is 161673709. The reversal of 161673678 is 876376161.

161673678 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 2×161673678² = 52276756316095368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161673671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1496925 + ... + 1497032.

It is an arithmetic number, because the mean of its divisors is an integer number (22454685).

Almost surely, 2^161673678 is an apocalyptic number.

161673678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161673678 is an abundant number, since it is smaller than the sum of its proper divisors (197601282).

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

161673678 is a wasteful number, since it uses less digits than its factorization.

161673678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2993968 (or 2993962 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 161673678 is about 12715.0964605071. The cubic root of 161673678 is about 544.7699031482.

The spelling of 161673678 in words is "one hundred sixty-one million, six hundred seventy-three thousand, six hundred seventy-eight".