164745780 has 96 divisors (see below), whose sum is σ = 497000448. Its totient is φ = 40656000.

The previous prime is 164745739. The next prime is 164745809. The reversal of 164745780 is 87547461.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 40855 + ... + 44705.

It is an arithmetic number, because the mean of its divisors is an integer number (5177088).

Almost surely, 2^164745780 is an apocalyptic number.

164745780 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 164745780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248500224).

164745780 is an abundant number, since it is smaller than the sum of its proper divisors (332254668).

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

164745780 is a wasteful number, since it uses less digits than its factorization.

164745780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3917 (or 3915 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 164745780 is about 12835.3332640801. Note that the first 3 decimals coincide. The cubic root of 164745780 is about 548.1988240840.

The spelling of 164745780 in words is "one hundred sixty-four million, seven hundred forty-five thousand, seven hundred eighty".