164665420 has 24 divisors (see below), whose sum is σ = 347057424. Its totient is φ = 65626176.

The previous prime is 164665409. The next prime is 164665421. The reversal of 164665420 is 24566461.

It is a super-2 number, since 2×164665420² = 54229401087552800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (164665421) by changing a digit.

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, 9322 + ... + 20401.

It is an arithmetic number, because the mean of its divisors is an integer number (14460726).

Almost surely, 2^164665420 is an apocalyptic number.

164665420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164665420 is an abundant number, since it is smaller than the sum of its proper divisors (182392004).

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

164665420 is a wasteful number, since it uses less digits than its factorization.

164665420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30009 (or 30007 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 164665420 is about 12832.2024609963. The cubic root of 164665420 is about 548.1096757767.

The spelling of 164665420 in words is "one hundred sixty-four million, six hundred sixty-five thousand, four hundred twenty".