164193990 has 32 divisors (see below), whose sum is σ = 417247200. Its totient is φ = 41209344.

The previous prime is 164193979. The next prime is 164194013. The reversal of 164193990 is 99391461.

164193990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160465 + ... + 161484.

It is an arithmetic number, because the mean of its divisors is an integer number (13038975).

Almost surely, 2^164193990 is an apocalyptic number.

164193990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

164193990 is an abundant number, since it is smaller than the sum of its proper divisors (253053210).

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

164193990 is a wasteful number, since it uses less digits than its factorization.

164193990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321976.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 164193990 is about 12813.8202734391. The cubic root of 164193990 is about 547.5861043453.

The spelling of 164193990 in words is "one hundred sixty-four million, one hundred ninety-three thousand, nine hundred ninety".