180640640 has 64 divisors (see below), whose sum is σ = 457274160. Its totient is φ = 68001792.

The previous prime is 180640631. The next prime is 180640651. The reversal of 180640640 is 46046081.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2579 + ... + 19181.

Almost surely, 2^180640640 is an apocalyptic number.

180640640 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 180640640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228637080).

180640640 is an abundant number, since it is smaller than the sum of its proper divisors (276633520).

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

180640640 is a wasteful number, since it uses less digits than its factorization.

180640640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16639 (or 16627 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 180640640 is about 13440.2619022101. The cubic root of 180640640 is about 565.2906745629.

The spelling of 180640640 in words is "one hundred eighty million, six hundred forty thousand, six hundred forty".