164290785 has 16 divisors (see below), whose sum is σ = 263238720. Its totient is φ = 87497280.

The previous prime is 164290757. The next prime is 164290787. The reversal of 164290785 is 587092461.

It is not a de Polignac number, because 164290785 - 2⁷ = 164290657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (164290787) 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 15 ways as a sum of consecutive naturals, for example, 3675 + ... + 18495.

It is an arithmetic number, because the mean of its divisors is an integer number (16452420).

Almost surely, 2^164290785 is an apocalyptic number.

164290785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164290785 is a deficient number, since it is larger than the sum of its proper divisors (98947935).

164290785 is a wasteful number, since it uses less digits than its factorization.

164290785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15568.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 164290785 is about 12817.5966936084. The cubic root of 164290785 is about 547.6936868150.

The spelling of 164290785 in words is "one hundred sixty-four million, two hundred ninety thousand, seven hundred eighty-five".