164717220 has 24 divisors (see below), whose sum is σ = 461208384. Its totient is φ = 43924576.

The previous prime is 164717209. The next prime is 164717221. The reversal of 164717220 is 22717461.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (164717221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1372584 + ... + 1372703.

It is an arithmetic number, because the mean of its divisors is an integer number (19217016).

Almost surely, 2^164717220 is an apocalyptic number.

164717220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164717220 is an abundant number, since it is smaller than the sum of its proper divisors (296491164).

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

164717220 is a wasteful number, since it uses less digits than its factorization.

164717220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745299 (or 2745297 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 164717220 is about 12834.2206619646. The cubic root of 164717220 is about 548.1671440348.

The spelling of 164717220 in words is "one hundred sixty-four million, seven hundred seventeen thousand, two hundred twenty".