11781660 has 48 divisors (see below), whose sum is σ = 35989632. Its totient is φ = 2856000.

The previous prime is 11781659. The next prime is 11781661. The reversal of 11781660 is 6618711.

It is a happy number.

11781660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11781659) and next prime (11781661).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11781661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8266 + ... + 9585.

It is an arithmetic number, because the mean of its divisors is an integer number (749784).

Almost surely, 2^11781660 is an apocalyptic number.

11781660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11781660 is an abundant number, since it is smaller than the sum of its proper divisors (24207972).

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

11781660 is a wasteful number, since it uses less digits than its factorization.

11781660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17874 (or 17872 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 11781660 is about 3432.4422791942. The cubic root of 11781660 is about 227.5458024754.

The spelling of 11781660 in words is "eleven million, seven hundred eighty-one thousand, six hundred sixty".