164257820 has 12 divisors (see below), whose sum is σ = 344941464. Its totient is φ = 65703120.

The previous prime is 164257813. The next prime is 164257867. The reversal of 164257820 is 28752461.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4106426 + ... + 4106465.

It is an arithmetic number, because the mean of its divisors is an integer number (28745122).

Almost surely, 2^164257820 is an apocalyptic number.

164257820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164257820 is an abundant number, since it is smaller than the sum of its proper divisors (180683644).

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

164257820 is a wasteful number, since it uses less digits than its factorization.

164257820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8212900 (or 8212898 counting only the distinct ones).

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

The square root of 164257820 is about 12816.3107016021. The cubic root of 164257820 is about 547.6570527253.

The spelling of 164257820 in words is "one hundred sixty-four million, two hundred fifty-seven thousand, eight hundred twenty".