164857220 has 24 divisors (see below), whose sum is σ = 377673408. Its totient is φ = 59948000.

The previous prime is 164857213. The next prime is 164857229. The reversal of 164857220 is 22758461.

It is a super-2 number, since 2×164857220² = 54355805972256800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (164857229) 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, 374456 + ... + 374895.

It is an arithmetic number, because the mean of its divisors is an integer number (15736392).

Almost surely, 2^164857220 is an apocalyptic number.

164857220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164857220 is an abundant number, since it is smaller than the sum of its proper divisors (212816188).

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

164857220 is a wasteful number, since it uses less digits than its factorization.

164857220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749371 (or 749369 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 164857220 is about 12839.6736718657. The cubic root of 164857220 is about 548.3224033897.

The spelling of 164857220 in words is "one hundred sixty-four million, eight hundred fifty-seven thousand, two hundred twenty".