164717920 has 24 divisors (see below), whose sum is σ = 389146464. Its totient is φ = 65887104.

The previous prime is 164717893. The next prime is 164717933. The reversal of 164717920 is 29717461.

It is a self number, because there is not a number n which added to its sum of digits gives 164717920.

It is a congruent number.

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, 514584 + ... + 514903.

It is an arithmetic number, because the mean of its divisors is an integer number (16214436).

Almost surely, 2^164717920 is an apocalyptic number.

164717920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164717920 is an abundant number, since it is smaller than the sum of its proper divisors (224428544).

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

164717920 is a wasteful number, since it uses less digits than its factorization.

164717920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029502 (or 1029494 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 164717920 is about 12834.2479327774. The cubic root of 164717920 is about 548.1679205504.

The spelling of 164717920 in words is "one hundred sixty-four million, seven hundred seventeen thousand, nine hundred twenty".