164845640 has 16 divisors (see below), whose sum is σ = 370902780. Its totient is φ = 65938240.

The previous prime is 164845627. The next prime is 164845673. The reversal of 164845640 is 46548461.

It can be written as a sum of positive squares in 2 ways, for example, as 156700324 + 8145316 = 12518^2 + 2854^2 .

It is a junction number, because it is equal to n+sod(n) for n = 164845594 and 164845603.

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, 2060531 + ... + 2060610.

Almost surely, 2^164845640 is an apocalyptic number.

164845640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164845640 is an abundant number, since it is smaller than the sum of its proper divisors (206057140).

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

164845640 is a wasteful number, since it uses less digits than its factorization.

164845640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4121152 (or 4121148 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 38.

The square root of 164845640 is about 12839.2227179063. Note that the first 3 decimals coincide. The cubic root of 164845640 is about 548.3095645584.

The spelling of 164845640 in words is "one hundred sixty-four million, eight hundred forty-five thousand, six hundred forty".