164621380 has 72 divisors (see below), whose sum is σ = 438734016. Its totient is φ = 51307200.

The previous prime is 164621279. The next prime is 164621393. The reversal of 164621380 is 83126461.

It is a happy number.

164621380 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3145 + ... + 18415.

It is an arithmetic number, because the mean of its divisors is an integer number (6093528).

Almost surely, 2^164621380 is an apocalyptic number.

164621380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 164621380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219367008).

164621380 is an abundant number, since it is smaller than the sum of its proper divisors (274112636).

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

164621380 is a wasteful number, since it uses less digits than its factorization.

164621380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15305 (or 15296 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 164621380 is about 12830.4863508754. The cubic root of 164621380 is about 548.0608071832.

The spelling of 164621380 in words is "one hundred sixty-four million, six hundred twenty-one thousand, three hundred eighty".