164640026 has 16 divisors (see below), whose sum is σ = 258185664. Its totient is φ = 78591744.

The previous prime is 164640017. The next prime is 164640043. The reversal of 164640026 is 620046461.

It is a super-2 number, since 2×164640026² = 54212676322561352, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23441 + ... + 29643.

It is an arithmetic number, because the mean of its divisors is an integer number (16136604).

Almost surely, 2^164640026 is an apocalyptic number.

164640026 is a deficient number, since it is larger than the sum of its proper divisors (93545638).

164640026 is a wasteful number, since it uses less digits than its factorization.

164640026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6805.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 164640026 is about 12831.2129590308. The cubic root of 164640026 is about 548.0814986147.

Adding to 164640026 its reverse (620046461), we get a palindrome (784686487).

The spelling of 164640026 in words is "one hundred sixty-four million, six hundred forty thousand, twenty-six".