164385720 has 128 divisors (see below), whose sum is σ = 576864000. Its totient is φ = 41523840.

The previous prime is 164385713. The next prime is 164385737. The reversal of 164385720 is 27583461.

164385720 is a `hidden beast` number, since 1 + 643 + 8 + 5 + 7 + 2 + 0 = 666.

164385720 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16515 + ... + 24525.

It is an arithmetic number, because the mean of its divisors is an integer number (4506750).

Almost surely, 2^164385720 is an apocalyptic number.

164385720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 164385720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288432000).

164385720 is an abundant number, since it is smaller than the sum of its proper divisors (412478280).

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

164385720 is a wasteful number, since it uses less digits than its factorization.

164385720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8050 (or 8040 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 164385720 is about 12821.2994661228. The cubic root of 164385720 is about 547.7991609560.

The spelling of 164385720 in words is "one hundred sixty-four million, three hundred eighty-five thousand, seven hundred twenty".