11639880 has 192 divisors, whose sum is σ = 44928000. Its totient is φ = 2557440.

The previous prime is 11639869. The next prime is 11639893. The reversal of 11639880 is 8893611.

11639880 is a `hidden beast` number, since 11 + 639 + 8 + 8 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78046 + ... + 78194.

It is an arithmetic number, because the mean of its divisors is an integer number (234000).

Almost surely, 2^11639880 is an apocalyptic number.

11639880 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 11639880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22464000).

11639880 is an abundant number, since it is smaller than the sum of its proper divisors (33288120).

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

11639880 is a wasteful number, since it uses less digits than its factorization.

11639880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 11639880 is about 3411.7268354896. The cubic root of 11639880 is about 226.6293575656.

The spelling of 11639880 in words is "eleven million, six hundred thirty-nine thousand, eight hundred eighty".