183664640 has 128 divisors (see below), whose sum is σ = 471852000. Its totient is φ = 68419584.

The previous prime is 183664639. The next prime is 183664643. The reversal of 183664640 is 46466381.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 183664594 and 183664603.

It is not an unprimeable number, because it can be changed into a prime (183664643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3112931 + ... + 3112989.

Almost surely, 2^183664640 is an apocalyptic number.

183664640 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 183664640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235926000).

183664640 is an abundant number, since it is smaller than the sum of its proper divisors (288187360).

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

183664640 is an frugal number, since it uses more digits than its factorization.

183664640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 183664640 is about 13552.2927949480. The cubic root of 183664640 is about 568.4276353773.

The spelling of 183664640 in words is "one hundred eighty-three million, six hundred sixty-four thousand, six hundred forty".