161678390 has 16 divisors (see below), whose sum is σ = 291271680. Its totient is φ = 64615680.

The previous prime is 161678371. The next prime is 161678411. The reversal of 161678390 is 93876161.

It is a super-2 number, since 2×161678390² = 52279803585984200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6470 + ... + 19110.

It is an arithmetic number, because the mean of its divisors is an integer number (18204480).

Almost surely, 2^161678390 is an apocalyptic number.

161678390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161678390 is a deficient number, since it is larger than the sum of its proper divisors (129593290).

161678390 is a wasteful number, since it uses less digits than its factorization.

161678390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13927.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 161678390 is about 12715.2817507124. The cubic root of 161678390 is about 544.7751955596.

The spelling of 161678390 in words is "one hundred sixty-one million, six hundred seventy-eight thousand, three hundred ninety".