164240840 has 32 divisors (see below), whose sum is σ = 371909880. Its totient is φ = 65275392.

The previous prime is 164240809. The next prime is 164240849. The reversal of 164240840 is 48042461.

It can be written as a sum of positive squares in 4 ways, for example, as 82555396 + 81685444 = 9086^2 + 9038^2 .

It is not an unprimeable number, because it can be changed into a prime (164240849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6797 + ... + 19356.

Almost surely, 2^164240840 is an apocalyptic number.

164240840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164240840 is an abundant number, since it is smaller than the sum of its proper divisors (207669040).

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

164240840 is a wasteful number, since it uses less digits than its factorization.

164240840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26321 (or 26317 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 164240840 is about 12815.6482473576. The cubic root of 164240840 is about 547.6381808948.

The spelling of 164240840 in words is "one hundred sixty-four million, two hundred forty thousand, eight hundred forty".