166490730 has 144 divisors (see below), whose sum is σ = 530318880. Its totient is φ = 36033984.

The previous prime is 166490729. The next prime is 166490761. The reversal of 166490730 is 37094661.

166490730 is a `hidden beast` number, since 1 + 6 + 649 + 0 + 7 + 3 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 82797 + ... + 84783.

It is an arithmetic number, because the mean of its divisors is an integer number (3682770).

Almost surely, 2^166490730 is an apocalyptic number.

166490730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166490730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265159440).

166490730 is an abundant number, since it is smaller than the sum of its proper divisors (363828150).

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

166490730 is a wasteful number, since it uses less digits than its factorization.

166490730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033 (or 2023 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 166490730 is about 12903.1286903603. The cubic root of 166490730 is about 550.1274966133.

The spelling of 166490730 in words is "one hundred sixty-six million, four hundred ninety thousand, seven hundred thirty".