164220140 has 24 divisors (see below), whose sum is σ = 394128672. Its totient is φ = 56304000.

The previous prime is 164220137. The next prime is 164220157. The reversal of 164220140 is 41022461.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 586361 + ... + 586640.

It is an arithmetic number, because the mean of its divisors is an integer number (16422028).

Almost surely, 2^164220140 is an apocalyptic number.

164220140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164220140 is an abundant number, since it is smaller than the sum of its proper divisors (229908532).

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

164220140 is a wasteful number, since it uses less digits than its factorization.

164220140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173017 (or 1173015 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 164220140 is about 12814.8406154739. The cubic root of 164220140 is about 547.6151728402.

The spelling of 164220140 in words is "one hundred sixty-four million, two hundred twenty thousand, one hundred forty".