166287890 has 16 divisors (see below), whose sum is σ = 303108480. Its totient is φ = 65672880.

The previous prime is 166287889. The next prime is 166287899. The reversal of 166287890 is 98782661.

It is not an unprimeable number, because it can be changed into a prime (166287899) 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, 104456 + ... + 106035.

It is an arithmetic number, because the mean of its divisors is an integer number (18944280).

Almost surely, 2^166287890 is an apocalyptic number.

166287890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166287890 is a deficient number, since it is larger than the sum of its proper divisors (136820590).

166287890 is a wasteful number, since it uses less digits than its factorization.

166287890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210577.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 166287890 is about 12895.2661856978. The cubic root of 166287890 is about 549.9039942619.

The spelling of 166287890 in words is "one hundred sixty-six million, two hundred eighty-seven thousand, eight hundred ninety".