164643240 has 32 divisors (see below), whose sum is σ = 493930080. Its totient is φ = 43904832.

The previous prime is 164643221. The next prime is 164643253. The reversal of 164643240 is 42346461.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 164643198 and 164643207.

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, 685894 + ... + 686133.

It is an arithmetic number, because the mean of its divisors is an integer number (15435315).

Almost surely, 2^164643240 is an apocalyptic number.

164643240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164643240 is an abundant number, since it is smaller than the sum of its proper divisors (329286840).

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

164643240 is a wasteful number, since it uses less digits than its factorization.

164643240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372041 (or 1372037 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 164643240 is about 12831.3381998917. The cubic root of 164643240 is about 548.0850650267.

The spelling of 164643240 in words is "one hundred sixty-four million, six hundred forty-three thousand, two hundred forty".