164005906 has 8 divisors (see below), whose sum is σ = 246064140. Its totient is φ = 81984528.

The previous prime is 164005859. The next prime is 164005943. The reversal of 164005906 is 609500461.

It can be written as a sum of positive squares in 2 ways, for example, as 161417025 + 2588881 = 12705^2 + 1609^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9580 + ... + 20488.

Almost surely, 2^164005906 is an apocalyptic number.

164005906 is a deficient number, since it is larger than the sum of its proper divisors (82058234).

164005906 is a wasteful number, since it uses less digits than its factorization.

164005906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18428.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 164005906 is about 12806.4790633491. The cubic root of 164005906 is about 547.3769380705.

The spelling of 164005906 in words is "one hundred sixty-four million, five thousand, nine hundred six".